Document mxmEqJvOE9yanraBkQpMr5Ng

:t'/r' ,' ) The Cosmetic, Toiletry and Fragrance Association, Inc. 1133 15th STREET, N.W,, WASHINGTON, D.C. 20005 >202/331-17/0 TELEX' 09-2073 M E M O R A N'lD U M Jamc;5 H. Merritt * -Pri-sidanl Norman F. EsUin, Ph.D, Vico Prosidant-- uc irnco E. Edward Kavanmrqh Vine P i tient- CobgrBSSio/nif Hofol/ons Mnrjarei W. Smith L'xccutfVe Secteh iy TO: The CTFA Talc Subcommittee FROM: N o m a n F. Estrin, Ph.D. DATE: November 2nd, 1976 SUBJECT: CTFA Talc Methodology McCrone has performed a very useful service by comparing and'evaluating CTF7i methodology. Their suggestions with regard to methodology and their other suggestions should be discussed at the November 10th Talc Subcommittee meeting. NFE;jj Attachment cc: Walter C. McCrone PLAINTIFFS EXHIBIT WCD-46 Goodhue WCD 000204 f / Y$ w aiter c. me crone associates, inc. '* * A ' COs.-:-uLTJft v'i Ut.TAM:iftOANAtY51S * M5CR05C0PY SH VO. PMT.ZJj. P fiO a tlttS * S0lO0-SrA7 WfUiSTRY '3 September 1976 Hr. Korean F. Estrin CT5A 1133 15th St., `.'7, Washington* DC 2005 ----------- Dear Dr. Estxiiw As you icigw, vet at >tcCrone Asrociatea, have done considerable work on tale and especially or. various mint-tal irzcuritics in talc. As a result vs have accumulated date, procedures (and prejudices) concerning these analyses. I have recently had occasion to look a,t the prepared CTFA procedures for ostc-atiforu minerals in talc and canrt .kelp feeling time our routine procedures are, 1 regret to say, considerably more eopVusticattd. Since 1 vas about to cotsr.it our c-Btr.ods to a paper for another publication (ur.iortunat?i!.y, for the FDA)-I fait that, as an intellectual acrci^e, X would recast the s-.tiO material as a CTFA method. I sa enclosing this horrendous document for your perusal and ayaiptithizii if ytu choose to quickly burn it nr the staka. Hose first, however, that X have retained, soioe of the features of your method 'that I liked. Still, in cur hands, the methods vs propose work, very veil. In addition, they are rapid and reasonably inexpensive. We are interested in Improving the competence of nicroanalysts generally and, as yen may know, teach about -AO courses a year in these procedures both hare and abroed* As a mat ter of act,' I 1.6ave this veehend where I will be teaching 3 brek--tc-back courses in the icehcification of asbestifora minerals by the nethoca covered in the infamous enclosure. Seriously, I don't propose yen adopt thssa methods in the detail Irve ,,ug-gested but I do suggest that you urge; each CTFA fember to cake sfctps now rl.se will lead to ch^ir ability to mv.kc such analyses. The tare each company knows about the products it makes aiiu the raw materials it usee the better able will that company be to -tay out of trouble and represent its best interests if trouble arises. Vc can help here through our teaching ar=. I auggent we offer & course- either directly through the CTFA.or simply to the nemhar companies. This course would train one-or more qualified sicrcanclysrs in pach company in tha use of che proposed x-ray diffraction &r.d dispersion staining methods for the study of cosmetic talc and possible contaminating substances. Wc would further aid each company in. setting up (purchasing, if necessary) tha equipment, supplies and rdneral standards required for such studies The entire package would include a one-week intensive, course in Chicago, eveluktion o f the company laboratory and equipment, furnishing sets of i s x SOUTH UlCHIGAN AVERSE . CHICAGO. ILUNCIS C3G1d . St2 **2 ;Ttu3 - CABLE: CHEMICTONE Dt. Korean Fi Estrin ?wge two , Standard samples-and eecc material and a follow-up over a several-month pariOL of progress in each company by means of a series of round-robin, sample analyses, Ve will sr^n off each c.ospAny when we. are satisfied their personnel and equipment can do a prefetsicnal jab of analyzing calc samples. The cost of this package would be $1500 per company. I look forvaTd to your response and hope I haven't scared you away. Tours Sincerely, tfctf:cdh Enclosure falter C. XeCrone Goodhue WCD 000205 COSKETC TALC DEFINITION : Cosmetic Talc is a unite, aasoatlPlly odorless, fine povder, ground fron naturally occurring rock ore, consisting mirily or hydreted cagnesicn silicate having the Ideal formula bggtSiqC,,-] < (OH.) with leaser amount* of naturally associated aiSora^c-"Sucb as ccldte, chlorite, dolomite, kaolin and fmagnesite, and containing no asbestos minerals detectable by x-ray diffraction. TEST SPECIFICATION K2TU0D Color....,.... buyer and showing ho -- change--after heating at 20t*C for 5 minutes Odor.------- buyer Id entificar ion. Positive 1. Close match to CTFA Spectrun with no in dication of. foreign materiels CTFA G 3-1 OR 2. (Alternate) Close match ASTfcl D 934-74 Povder Diffraction File ` No. 19-770, published by ASTS, shoving the oast intense reflections at d valves about 9.35, 1.53 end 4.59 A . Slip........ Lustre....... ttstef-Soluble Iron......... Fassea test USP IX, page 48? Screes Test.. &C* minimum through 200 atsh Finer grades: as .specified by . tho buyer Vater Soluble Substances.. ' * 0.12 naxiff.ua US? XIX, page 487 Soft tost for ''Reaction and Soluble Substances*' Acid Soluble Substances.., Loss of Ignition........... Arsenic (as A s ) ,r. Ac specified by the buyer6.0% tax isun .5 M maximum 3 jptn Daxicum Lead fas Pb) . ,,.. 20 ppm maximum Amphiboles............ ..., None detected by XD (Asbestlform Treraulitc et al) Free Crystalline Silica..... (Quarta) As specified by the buyer CTFA E 32-1 DSP XIX, page 4S7 CTFA F 1-1, Parts 1-A and 11 CTFA F -2-1, Parta 2-A and 11 CTFA J 4-1 CTFA J 5-1 <D7A) Alternates CTFA J -1 (X-ray) ACID SOLUBLE SUBSTANCES IK TALC Principle A sample of talc is alxi-d with diluted hydrochloric acid and the insoluble portion is removed by ' centrifugation and filtration, The filtrate la sulfated, evaporated to dryness and ignited. The acid soluble cotter is determined gravim^tiically as the sulfate. Apparatus 1. Controlled rcvipctatu.ee `water bath 2 ; Beaker, Griffin, 100 cl 3. Volumetric flask, 50 nl. 4. Centrifuge . 5. Centrifuga tubes (2), 30 nl' 6. Graduated Cylinder, 50 d 7 Sintered glass funnel, ultra fine porosity, 0 ml (0.9 to 1.4 ytO Corning ',,'S&OfiO-UF or equivalent Vacuum flask, 125 Goodhue WCD 000206 9, Pipette, 10 ml ' 10. Platinum or Vycor evaporating dish or equivalent Reagents 1. Hydrochloric Acid, diluted, lot v/v 2. Sulfuric Acid., diluted, 102 v/v Procedure Vei*h 2 g (0.001 g) of sample into' a 100 rtf. beaker, add 40 ml 'diluted hydrochloric acid, and place ia water bath at `55* (2,,5*C), with occasional stirring, for 30 minutes. , Inmealately remove beaker from bath-nnd pour contents into a 5Q -ml centrifuge tube, rinsing beaker and stirring bar with 2 to 3 nl of distilled water. (Sate 1). Centrifuge at 3000 RFM for 30 minutes filter supernatant through ultraflnc porosity sintered glass funnel into vacuum flask, using 2 to 3 ml of distilled water to rinse the centrifuge tube and funnel, and using care to avoid dislodging the packed talc at the bottom. c tha tube. Filtrate r^sr be clear '(Note 1). Pour filtrate into 50 ml volumetric, flask, rinsing with 3 to 5 ml distilled water. Adjust to volume with distilled water. Pipette 21 ml of adjusted filtrate into tered, ignited evaporating dish. Add 2 ml of diluted sul-furic-- ici-d and evaporuto to dryness. Igr.ica at 6-00^ (23*C) for 1 hour. Cool and weigh. Calculation 2 Acid Soluble Substances height of Residue in g x 200 Veight of Sample in g Note 1* Examine the centrifuged sample carefully to assure good clarity be fore proceeding with filtration. If haziness is detected, centrifuge the sample for an additional 15 to 30 minutes as necessary. ASBESTIPORH KIKERALS IN COSMETIC TALC The presence of asbestiform minerals in calc is determined by x-ray diffraction with a-sensitivity of about 0.52 by weight. The mineral identi fication ^ is confirmed and the asbestlfcrti habit Is determined by polarized light microscopy with the added help furnished by dispersion staining. If >0.52 of. asbesciforiA mineral is present Che sample is rejected. If the non-asbebtiform habits are present, e.g., lizardite, nntigorite. grunerirc, cvrcaitigtenice and sreibeckite - the samnle passes, if <0.52 of rhe asbestiforn habits are present the sample passes. (Note: The polarizing micro scope with dispersion staining will detect 0.012 of any mineral with net more than 30 minutes scanning time and if tht: particles- are, at least, 0.2 x 3 pm.) Goodhue WCD 000207 PART I ----ASRESlIFQHI UIKERALS aT X-RJW DIFFRACTI-OK Principle The x-ray diffraction- method Is based vpoQ the principle th:t when a crystalline material is placed in, an x-ray beam, a portion of the x-rays are diffracted by each sec of atomic planes within the crystal. The diffrac ted rays strike a scintillation counter .as the sample is scanned through a prescribed angle yith. the resulting development of peaks corresponding to each interplanar distance (d). A peak with a d value la the range of .8.04 to 6.5 A for a talc sample is strong"' evidence for ,, the presence of amphlbole. The licit of detection of aiphibole by careful application of this method la 0.55. jfBrrJ5g ! X-ray diffractometer, employing nickel-filtered copper K-aipha radi ation', horizontal or vertical goniometer with variable scan speed capability, suitable talc pellet sample holder, variable speed recorder, electronic panel including r&tisater, variable attenuation and time constant settings 2. Hydraulic press, capable of attaining a pressure of 15,000 to 24,000 lb applied to a 5" raa 2. Mortar and peatie or grinding mill (Tote I) 4. Varing Blendor, or equivalent blender 5* Spex ilixer/Klll, or equivalent mechanical mixer 6 Sieve, 325-mesh ?. Optical microscope (Hte .2) ..... 1-1/4'1 pellet press Reagents ', 1. Standard tale sample, containing no detectable amphibole minerals -2. Standard tronolicc sarcle* (at lear.c 55 pure), ray be obtained ty ordering from The Cosir.ctric Toiletry end Fragrance Association, Inc., 1133 Fifteenth Strict, i.UT,, Vashir.gtOn, D.G. 2005 3. Denatured ethanol * 4. Boric acid 'Procedure The procedure consists of scanning (l*/ain) under otherwise high tivitJ conditions, a compressed pallet of the sample talc over the 2 range A A)from 4* to 34*. (about 20 to 2,6 with Ctl Ke radiation. Check the recorded trace for the peaks tabulated in Table 1. TABLE 1 Possible Characteristic Strong Peaks in Che X-Ray Spectrum of Talc 20, decrees .31 9. 9.66 10.5! 10.52 10.55 10.61 12.01 12.04 12.20 12.51 IS.59 19.32 19.45 19 C 20.49 20. S3 d, A 14.0 9.35 9.15 .40 5.40 8. 38 6.33 7.36 7.34 7.25 7.074.674.59 6.56 4.53 4.33 4.26 I SO 100 2 10 100 100 100 100 100 100 a 3 45 25 12 6 35 Kinercl chlorite talc cutimingtnite (azoeite) crocidolite hornblende tre;>:slitc, actinolice, anthophyl1ite cunr^infltcaite chrysntile lizardlte antigorite talc talc talc talc talc talc quartz Goodhue WCD 000208 23.02 2A.3 2;. 50 24.51 25.25 25.S3 26,64 27.26 27.33 27.59 23,59 23.60 IS.60 23.63 23.77 29.16 25.55 30.S6 31,60 31,76 31. 82 32,19 32.66 32.63 32.S3 32.90 33, C9 33.15 33.19 35.60 35.85 36.04 36.56 33 ,,49 39.40 41.40 ` 3.S6 ' 12 3.66 100 3.63 60 3.62 60 3.541 BO - 40 3,343 -- -- 100 3.263 75 3.2o 30 3,23 50 3,121 100 3,12 40J 3,12 55 3.11 100 3.10 70 3, Go 100 3r02--- - -- 10 ` 2.885 10 2.829 20 2.314 100 2.SI 1Q 2.773 60 2.756 70 2.742 100 2.726 40 2.720_ 60 2.705-- ~ 90 2.70 30 2.697 20- 2.52 90 2.503 IS 2,49 ICO 2.45S, so 2,337 ` 2 2,285 . , 18 2,192; 30 calcite chrysotile lizarditc. antigoritc Chlorite apatite quartz trentiite hornblende cAthophyllite tremolite talc crocidolite actinolite hornblende unthopuyllitc, amosice calcite dolomite chlorite apatite calcite epatite asiosice magnesite crocidolite apatite treuiolite sccinollto hornblende antigorite ragno-site liza.rdl.te chiyeotile talc calcite dolomite 41.98 42.99 45.03 44.ei 48.05 43.65 50,16 50.55 51.10 51,25 53,88 59.26 60,24 60.41 60.50 61.80 2.15 2.102 2.095 1,94 1.892 1.87 1.817 1,804 1.726 1,781 1,700 1.558 1.535 1.531 1.529 1,500 60 45 18 12 5 4 17 0 30 35 2 60 70 55 60 lizarditc magnesite calcite rtrgnesiea tremoline talc quarte dolomie dolomite magnesite calc chryscrtila llzardlce talc lizarditc Some minerals, &>. carbonates quartz, hornblende Etc. have been listed here net because or any known harmful effects but because they ray be ob served In talc Samples. Under ideal conditions 0.5--1.OX of all of the above minerals should be indicated by a possible peak ia the 4*-34* range. Appropriate peak, re gions for the Indicated mineral should then be scanned at 0.1*/sin as indi cated below. Should the presence of a imall peak, above the background "acise" be in question, it will be necessary to statistically evaluate the can nade at 0.1*/iain in the suspected peak rcEion(s). A. timcc/accler is required on the electronic panel of the x-ray diffractometer. Ia order for a peak to be sta tistically significant, the peak intensity must equal or exceed three stand ard deviations i3*? ) above the average background intensity 0 0 s N + 3^ - minimum peak intensity* K average background count "VT Goodhue WCD 000209 "Peak" 10.0 10*2 Figure 1 "A" . "E'V 10.3 10.4 10,6 10.S 10.7 11,0 *20 Example: In Figure 1. Peak Backfireund Region A. * i*........ Region *x *... Region ("20) ' 10.40 to 10.60 ' 10.30to10.40-- 10-.-60-to 10.70 Tima (sen.) 120 60 60 Background Pesk 10.40 to 10.60*26 tine secs, count Region A 1C.30 to 10.40*26 tine'.reea. count lesion S ' 10.60 to 10,70*20 cine sees, counts 120 120 120 Average 50,332 59,870 60,105 -60,102 60 23,754 '60 23,943 60 23,634 28,787 60 28.506 60 28,368 60 28,204 28,359 X = 25,737 + 28,359 " 57,146 J - 57,146 - 239 3J - 717 N + 3J *V57,14& + 717 = 57,863 The actual nunber of counts obtained for the integrated peak inten sity vas 60,102; therefore, the "suspect11 peak is statistically present 1* che scan-1* Standard Preparation 1 Optimal iuscxuenF-condi"tioni-raust first be determined with the use of standards contaioi&s 1,0*,*' 0,752, 0.52 by weight of the-suspected contami nant prepared in a standard talc whichis free of interfering peaks. Weigh out appropriate amounts a t the standard talc and the mineral of intercut both of which have been ground 'to pass a 325-aesh sieve. Transfer to a Waring Blendor. Add 100 ml of ethanol to the blender and blend at low speed for 5 minutes. Carefully transfer, with repeated ethar.ol washings, tht contents of the blondpr into a large beaker. Evaporate the ethanol on a steaa bath. Shake the sample in a plastic vial for ` 5 minutes on a Spex Mixer/Kill to remove clumps and caked sample resulting froa the evaporation of ethanol. Determine by microscopy the homogeneity of the prepared standard previous to cho x-ray diffraction, analysis. Press the boRogcneous standard into a 11/4" pellet with a backing of boric acid. Transfer 2 (0.2) gram of standard to the dic-holder and evenly distribute on a polished, scratch-free die. Distribute 4 (0.2) grans of boric acid evenly on the talc layer. Prose the mixture into a pellet un der conditions suitable for obtaining a saooth. planar surface (for example, a ptDRfcure of 15,602 to 24,000 lb calculated on a 3" ran has been found to pro duce suitable pellets). The resulting pellet must have a tele face which 1* free of flaws; if not, the pellet must be discarded (Rote 3), Sample Preparation Prepare two pellets from each sample in the cenncx described for the standard pellets. Make sl qualitative scan iron 4 to 34*26 on one of these pellets to ascertain the presence of nbnr-calc minerals having interfer ing peaksi Goodhue WCD 000210 InscTcitr-enration Instrumental variables ^fe optimized on the IS standard. Lover standards are than analyzed under the 'optimum conditions to deter mine the loVcr level tf detection, Of-major importance in obtain ing raxita.m instrument sensitivity are a slow diffractometer speed combined with compatible recorder speed, and high attenuation com bined with a statistically acceptable time constant on the raceme- tinder appropriate instrumental conditions the peak obtained for the 0.5S standard should be detectable'^bove background noise as shown in "Figure 2 for trettolite-. Typical instrumental conditions employed tor the Siemens Diffrac tometer (Model No. K3S6-X-M3. and Counter and Recorder Unit (Type T) arc: Radiation; Cu with Ka filter on 4QXV aiid 24 mA, Divergence slit: 1* Receiving slits 0.2 ran (.007") Goniometer speed; 3710*26/minute Recorder speeds SCO ra/hour Artenuttion: 1 x 103 impulses/second Tins constant; T (s) " 4 Statistical error of 1.12 under these conditions Rise Time " 0,12 Attenuator " 20 PAR.! II: ASbESTIFORM AiiPHIiiOLX MINERALS SY POLARIZED LIGHT MICROSCOPY A3 DISPERSION STAINING AP?nr<-Cus 1, Polarizing microscope., Best results will be obtained if the instru ment includes the following: \ a. Individually-centering objectives or centerablc stage t. Lertrand .lens C. High--intensity light source d. Centering condcnser/substage 2. Dispersion staining device (Sore 4> 2. Vacuum filtration equipment, including either a porcelain cone -with glass fiber filter mat or a porous glass boctor. cup - Reagents 2. Cargille immersion liquids: n^J - 1.550 (1G> series); (Kobe 5) n^5 => 1.605 (!!D D )' t 5 - 1.660 (RP 11 ) Dq S - 1.710 Q t " ) Optical Microscopy end Dispersion Staining Carefully adjust the dispersion staining objective for optimum viewing of central stop colors. The microscope is first'arranged for Kotiler illumination: lamp iris (field, diaphrna) in focus in the field of view; lamp filament in focus in objective back focal plane.' The lac?, if movable, should be placed- close to Che nirrer so that the image c the leap filament is as n u l l as possible in the objective back focal plans. This along with oyervoltlng the laop by 15-2GZ and removing the daylitc bind filter will .ensure bright central stop color and detection of cubnicronater particles. Goodhue WCD 00021 The stage should next be centered and the central scop should he'precisely centered with respect to the image of the subsLcge irii (aperture diaphrcm) in the objective back fecal plana. The aylstege .iris is Chen closed just behind tha central atop and the Bertrand.lens (or equivalent viewing s y s te m ) is repaved. ' The preparation is scanned for Xg colors in the visible; critical study- of n area or of a given particle Is carried out with the field diaphrart yearly closed around `the colter portion of the field of view. Identification of ron-talc minerals by dlspersiiTt stti-njnn. Haunt a representative -sample (about 0.1 mg) In sha following Cnr- fiille refractive 'index liquids and oiininfi carefully pr non-talc substances. The particles e t c rwuared in the drop of Cargill liquid between slide a n d eoversliprf the particles are best dispersed by sliding the covarelip with a rotary nation cf a pencil' eraser "grippin'?1'1 the covoffilip, - The final pi-cp should bn thin and the cbvcralip should, be parallel to the slide (this avoids a "prisa" shaped prop chat will decanter the image of the cubstage iris relative to the central stop). The slide and coverall? must be carefully cleaned before usa and the pencil eraser must be -dipped la diluted rubber ecsfcac ftttd dried before usa to avoid transfer of particles to the top of the CQVersllp. The minerals to be checked for includei a or a Refractive indices s t or r Cntysotilc Lizsrditc Antigoritc Chlorite Quarts Calcitc Dolomite Kagndslt Hornblende Forsteritc Talc An thophjf1111 u Treraolite Actinolite Areositc Ctocidolite { Cuznaingcoaite l GrsBvrite ( daucophime \ EIcbccki 1.545 1.555 1.564 1.600 1.544 1.656 1.679 1.700 1.655 1.640 1.540 1.525 1.599 1*623 1.648 l.SSa 1.535 1.695 - e 1.566 1. 603 1.665 1.656 1.569 1.635 1.612 1.640 1.658 1.703 1.940 1.704 1.556 1.556 1.570 1*610 1.553 1.436 1.500 1.309 1.672 1.674 1*595 1.653 1.622 1.650 1.674 1.715 1.645 1.710 Goodhue WCD 000212 Hierais, especially silicates but also the isor.otphous series of carbonates {calcita, olorite. -.luEMwiie etc.) vary. .ir. refractive index. Figure 2 a. sad b. show aversaa indices for the minerals which night he found in talc. Generally, the dispersion staining curves for these minerals move parallel to themselves as the composition changes. The birefringence values g-e and t-m) will generally remain nearly constant for a given mineral although the indices themselves may vary considerably. The combination of crystal morphology, "and opt.tcs is also a gteat 'help. tubing sure of the identity o a given mineral. One should lcckfor different views of a given mineral and/or vary the view on a single crystal by tapping gently on the top of the coverslip with a needle. In this Wily riberlike tale plates on edge can be tipped inta the plate view and quartz tail be Bta^e to show c a d veil -aa u . 11 Both morphology an optics are acted a order to identify the asbeszlfcrmoiiaerals. To be as'oestifora requires that they be fibers, not sliver*, Msurir.s <3 yn,in dii^et^r, <30 u=i in length end huve a length to width ratio of at least 5:1. Bgarairta the Sample for asbestiforn: or fibrous japhihole mineral In order for an sEiphiboi Tiir.Dral to bo considered aGbostiiorm or fib r o u s it c u s e neet the Collcwins OSHA definition (Reference *). 1. _pa^ticlts c!U9t appear to be fibrous retber thzn as crystals or sli^ vers. 2 The ts:;ia?na diameter of a fiber to ba counted is 3 tnicronetcro. 3- `The aximum length of a fiber to be counted 30 MicramtiCar. ,4 The length to width-tatio nust be 5 or more to 1 -that is, 5 times dr nor, longer than, vide 5, The separate or individual fibers isuat contain fibrils or the uundlc of itichi|T-.effectr unless they are at a non-divisible scogfi. A cunnot be subdivided sn would oc counted, If roots the other criteria. The leiif'th to width ratio of 5 or moro to 1 is itn*. meant Lo imply chut other particles arc rot hazardous. The analysis proceeds by pouncing the sample in. successive Cargille liquid with identification of each rainerai showing visible \ Q colors in each liquid. The first liquid is np >- 1.55 25 Camille high-dtmarsion liquid r.^ - 1.330: i repres'entative sample, about 0,1 mg. mounted In this liquid will show characteristic 1Q colors for any of the following: talc, quartz, chrysot , lizard ito, antigorice ar.d many fibers (paper, silk, viscose rayos and hunco hair etc.).' The crystallographic data in Figure I should ensure ftentificacion of most of those substances or allow the conclusion that any ocher substance showing colors in this liquid is net one of those listed (Figure 3). characterization of this extraneous substance will often be possible by referring to the Partile Atlas. 25 Camille high dispersion liqu?d_nD__" l.~)5: Chxysotile and all ataer substances giving dispersion staining col ors in liquid 1.530 will be white or pale" blue in 1.605 (Figure 4). Talc is the on ly substance in this group that shows a 10 close to the visrblo (oa 700 nm). All talc plates show both it's ( 6 T) close to 1.605 in the red hence the central stop shows a pale blue in all directions lying in the talc plate and white corresponding to the o direction. Other minerals showing colors in Hjj - 1.605 include trc-.olite, chlorite and actinolite (Figure 5). Camille tlculd nn - 1.660 (T.F series) Non-talc minareis showing dispersion staining colors la "j 1-toO include actinolite. forsterite. hornblende, calcite. curaingtonice and dolo mite (Figure 6). Goodhue WCD 000213 Goodhue WCD 000214 rtft ff* u M ptt m mOp Q1 r. Cj r A I 1 ^ ^o fi - "B3 H * !"*,sfl O -* V O 1-* O f * rr Goodhue WCD 000215 Actinal te; 1 '1 j , .v; pale blue (700), b y*Nw bluc-greiin (ci 660) Calcites pele blue (-700) . y " | /*"pele b3uk (ca 700) Torc t r ite : Y* L_rt blue-grcpn (640) y allow {4SO) Q j, ' v, palo bluR (>700) blte-gr^ 640)" > Hornblende: g y pale HIuo (>700) I550) $ ble-jrc-cn blue rca*- Cisr-^lnr-.t-frnicci a Muo-Rraarv (660) yellow \ ';y05 r -- 7---- :------- blue QfiO) [ . Y 1-" | p.plt'-i-n yjallow (510) v e /a t ' i - '. 'i white (40.0) p white (*400) | y'-*-- > white (`j<400) latite: r ' w bTuM-reen (700) iwii<s blue-green (>700) ttPj ^SJiluc-'jjrcpri (700) blue-green (700) 71gur< 5. Central atop dispersion staining colors in Cargille liquid nD 1.660 (K?. series). ul C ur n ln p to n ic e : a . wbiie (>>700) / ^ " v. pale ilue (>700) --------- /------ >----- /3 j v. pale blue (>700) . r * -- 1-- 'V, pile >lua (>700) Ofuturitci 0 , j p.-ilc Muft (7C) r y *- yellow |i9Q) / _________ . ^1^1C (ISO) 'T w c - J c t l M Crocideliio: f i j hlue t500) SC---llufc"K^a in (660) Y ^ yello1* (490) | G K~'~j:''"'>_r~-p.cnra"f;;i3Q) Kagncsi te: vhice (>70blue (6(fC) Figure 6. Central stop dispersion staining colors ir. Cargille liquid njj - 1.700 (li series). Goodhue WCD 000216 Cir^yi-e lirui-d 1.7GQ (K series) Kir.era.ls to look for in * 1.700 include cuicninfitoniti;, grunc- rito, crocidolite and magnesite. Report rg.t:Us bole fib:^Tit,11- |TABbcsM font Afrph-iholc Present" or ar, "Ashastiform A m nM- It is imperative that both dispersion^a'caining color and fibrous morphology criteria be satisfied before identifying a particle as asbestiforn amphibole, since other substances say show colors similar to those described. Tfctes 1. Talcs to be arilslynvd and the'.standard minerals used to prepare standard suuplee must be -325 xaeah (maximum pjtcida siee of 64 mi crometers) . Te'\XaAr Analytical Kill (Model A-lOj Is recoimended. It is available fxca: le b s u ir Company P. 0. Box 572C2 Cincinnati, .611 5212- -- 2. It Is importar.c tint the homogeneity of tha prepared talc-tremolitc standard aeples.be verified by optical.-microscopy,, 3. This requirement is critical since excanslve surface scatter will .cause abnormally high background counts. A. The only cotraercidlly available dispersion staining device is sold by: Kalccr C. KcCrone Associates, Inc.' 2S20 South Michigan Avenue Chicago, IL 60616 5. Available from: ------- - R, ?. Cargllle Laboratories, lac.. Cedar Grove, KJ 07QC& or from laboratory suppliers R e fe re n c e s 1 . R o h i, A. K . A. K. L a n ^ e *, E n viron m ental H e -lrh P e r s p e c t iv e s 9 95 C1 P7 6 ) , --------------------------------------------------------------------------- 2. Rubin, 1. 3, X. J. Kaft^iore, Environmental Health Perspectives 9. 31 (1974). ---:--------------------- 1--------- 3. L. S. Birhy, X-Ray Spectrochepical Analysis, pages 5455, Tater' science Publishers (1959). 4. MTreaolite and Talc." U.S. Department of Labor, Occupational Safety and Health Administration, Field Information Memorandum $74--92/ Nover-ber 21, 1974. 5. KcCronc, "W. C. and. J. D. Dally, Particle Atlas, 2nd Edition, Ann Arbor Science Publishers, Inc. (1973). Goodhue WCD 000217