Document zzzqkzpdkMj7QEE8RBGNx40NR

ORGANIZSO 1875. THE UNITED STATES POTTERS ASSOCIATION ' TELEPHONE: FULTON 6-4225 EAST LIVERPOOL, OHIO 4 3 9 2 0 E . S. MORSE TREASURER OFFICERS _ JO H N C. THOM PSON PRESID EN T E A ST LIV ER PO O L . O H IO j i ! RICH ARD B . SM ITH F IR ST VICE PR ESID EN T EA ST LIV ER PO O L . O H IO j ! JO H N M. P1NNEY SECO N D VICE PR E SID E N T EA ST LIV ER PO O L . O H IO j j j JO SEPH W . GREENW OOD TH IRD VICE P R E SID E N T SALEM . O H IO EDWARD SAW YER A SSO CIA TE VICE P R E SID E N T ZA N ESV ILLE. O H IO j j j ; EXECUTIVE COMMITTEE J . M. W ELLS CH AIRM AN M. W . THOM PSON J. H. KELLER DAVID G . BO Y CE E. S. MORSE F. C. HENDERSON JO H N GEORGE | J I ii j | July 13, 1967 Dr. Robert A. Kehoe, M. D. U niversity of Cincinnati Kettering Laboratory Eden & Bethesda Aves. C incinnati, Ohio 45219 Dear Dr. Kehoe: I was pleased to receive your letter of June 22nd and think that your suggestion is excellent. How e v er, I think we w ill w ait u n til O ctober a t w hich tim e a ll of the members w ill have monthly determ inations on their lead glazes covering one year. It is very magnanimous of you to offer your services on an out-of-pocket expense basis and, as soon as we can crystalize on a date, I shall be in touch with you as to whether it is agreeable. Very truly y o u rs, BWM/A B. W . M erw in, Chairm an Research Committee I j I it I K 0 0 0 8 3 1 7 N9684 June 22, 1957 Sir. B. W. iiarwin, Chairman Besearch Committee The united States Potters Association East Liverpool, Ohio 43920 Sear Mr. Msrwia: I was greatly pleased by your letter of June 19th, in which you describe the progress that has been made toward the goal which was sot some years ago for collecting information on the problem of your industry in relation to lead-containing glazes. I was the more comforted, in relation to my own shortcomings, with respect to furnishing your group with a full report of our findings and our views concerning them. I am fully aware of the fact that both findings and views ware presented to your group in a less formal, and probably a less effective manner, but I am also aware that this was not enough. Perhaps I can still make amends. A great deal of water has gone over the dam, with respect to the environmental aspects of the distribution and use of lead, since we talked together. 1 think, in view of the comments in your letter, that it would not be amiss, if your group can afford the time, for us to get together again, and discuss the position of your industry and corse to a decision as to what should be done. There are several matters to consider. I agree that it would be 'wise to discuss the situation with the appropriate health officials, but I am not certain, at this point, whether this involves the Public Health Service. 1 believe that the Food and Drug Administration is the official authority in this matter. On the other hand, it taay be advisable to consult informally with appropriate representatives of the Public Health Service. I believe that it would be wise to write to Dr. Goddard of the Food and Drug Administration and to Surgeon General Stewart of the Public Health Service, informing them briefly of the matter and suggesting that one or the other or both of them might wish to designate a representative to confer, informally, with your group, as to the part, if any, that should be played by an official agency. Let me make a specific suggestion. I shall be glad to act for you in this and other matters, to consult with you, and to be present, if you choose, in any discussions which you may have with governmental people. You may come to the conclusion that this is unnecessary or inadvisable, and if so, I shall not be offended. However, I am offering say services, at the cost to you of my out-of-pocket expenses, partly because of my keen interest in this matter, and partly because, having fallen down to some extent in my own contribution, I wish to assure you and your associates that I have not abandoned you. (I even expect to prepare the report of which I have spoken repeatedly. I have gathered together all of the necessary material, against the time when I could free myself of other pressing duties long enough to attend to it.) Let ms have your opinion on these matters at your convenience. I have but one fixed engagement in the near future. You referred to it in the last V)W Mr. B, W. Msrwln, Chairman Page 2 June 22, 1967 enfence of your letter. I have planned to be in Montana in August, and should not like to delay or interrupt ay rendezvous in the wilderness for any reason, for I can hardly arrange it, as Hatters now stand, at any other tiae. Sincerely yours, Robert A. Sehoe, M.D. Professor Eaeritus of Occupational iSedicine X 0008313 ORGANISED 1875 THE UNITED STATES POTTERS ASSOCIATION I TELEPHONE: FULTON 6 -4225 EAST LIVERPOOL, O HIO 4 3 9 2 0 j?i ' E. S. MORSE . TREASURER OFFICERS JO H N C. THOM PSON p r e s id e n t e a s t LIV ER PO O L . O H IO RICH A RD B. SM IT H f ir s t v ic e p r e s id e n t e a s t LIV ER PO O L . O H IO JO H N M. P1NNEY SECO N D VICE PRESID EN T EA ST LIV ER PO O L . O H IO JO SEPH W . GREENW OOD TH IRO V ICE PRESID EN T SA LEM . O H IO EDWARD SAW YER A SSO C IA TE V ICE PR ESID EN T ZA N ESV ILLE. O H IO EXECUTIVE COM MITTEE J. M. W ELLS CH AIRM AN M. W . THOM PSON J. H. KELLER DAVID G . BOYCE E. S. MORSE F. C. HENDERSON JO H N GEORGE } 1 June 19, 1967 Dr. Robert A Kehoe, M .D . U niversity of Cincinnati Kettering Laboratory Eden & Bethesda Aves. C incinnati, Ohio 45219 Dear Dr. Kehoe: . The Research Committee and Lead Industries A ssociation are nearing the completion of our in v es tigation at Rutgers U niversity and, feel we have compiled a great deal of information on the formulation of lead bearing glazes as regards lead solubility. Since O ctober, 1966 a ll members of the U .S .P .A . have been sending cups glazed with production glazes to Pittsburgh Testing Laboratory to be checked for lead release by the dithyzone method. Our aim is to accum ulate some history on present production glazes so that we w ill be able to talk more in tellig en tly on acceptable lim its. A year ago I wrote you stating that A .S .T .M . had agreed to start the wheels in motion, to move the dithyzone te s t from a ten tativ e standard to a full standard. I failed to follow this close enough and this spring found that nothing had been done. However, with a little prod ding they have now started to make this move and I hope by this fall to have the method c la ssified as a full standard. We feel that we are about ready to consider the possibility of arriving at an industry standard and are in a quandary a s how to proceed. Mr. Harry Thiemecke of the Homer Laughlin China Company and I feel tla t the U. S. Public Health Department should be involved since we are just a group of engineers and have lim ited knowledge and neither back ground nor training in the physiological asp ects of lead. tfE 0008320 Dr,, Robt. A . K eh oe, M .D -2 - June 19x 1967 Due to the fact that you have had considerable contact and experience with these people/ we thought possibly you would be able to te ll us who to con tact Also we would appreciate your thought along this lin e . Maybe we are thinking of the wrong approach as we are neo phytes and are w ell aware of it. I am enclosing a copy of my research committee report at our annual meeting in Pittsburgh th is p a s t D ecem ber, You w ill note th a t I included a part of your la st le tte r to me in the report. This report should pretty w ell bring you up to date on what has transpired this past year. I hope you will be able to get your annual fishing trip to Montana and have an enjoyable tim e. Yours very truly, BWM/A Enc. B. W . M erw in, Chairm an Research Committee 0008321 s po r t o p t o e r e s e a r c h c o m m it t e e C onsiderable publicity has been given to lead during as evidenced by the following in cid en ts. The New York C ity health departm ent during November and December, 1955, had a case of lead poisoning traced to Ja p an e se m ugs. Mr... Edwin Ludew ig, A s sista n t C om m issioner of Environm ental Sc n ita tio n , w as in charge of th e s e h e a rin g s, w here i t w as brought o it th a t the e n tire pigm ent w as rem oved from the in te rio r of sa id r mgs w hen fille d w ith 4% a c e tic acid and allow ed to sot overnight, r e s u lt, th e New York C ity h e alth departm ent p lac ed on erabaxgo on th e mugs in q u e stio n . M r. Don Fowler of the Lead InduciTies A ssociation was in co n tact with Mr. Ludewig a t th is tim e o.n<1 a c te d a s our re p re se n ta tiv e a s w ell a s th e Load In d u stries Asse e ia tlc ru He w as informed th at no d ecisio n s would be m ade u n til v;o could a d v is e thorn. This p a st spring and summer a geochemist, from California Institute of Technology, Mr. Claire Patterson, stirred up quite a controversy aimed at lead in a ir due to the tetra-eth y l lead additive, used in most of the present day gasoline for use in autom obiles, which escapes to the atmosphere via automobile exhau tOiljJ,ViJ h earin g s w ere hold in W ash in g to n , D. C . by Sen. M uskie's com m ittee. Dr, Kehoe of the Kettering Institute at C incinnati, Ohio w as one of the expert w itnesses for industry and -2 w as credited with doing on excellent job in sp ite of harassm ent. T hose hooiinyM o b tain ed n a tio n a l co v erag e via TV. Lead from g la z e s w as not m entioned a t tho h earin g s, howover, it is only a m atter of time until some eager politician may pick up th is subject and try to make som ething of it. The following paragraph from a com m unication from Dr. Kehoe a fte r the h e a rin g s, l b e lie v e , q u ite c a p a b ly _covers th e ram ificatio n s of th e s e h e a rin g s: Abu a d d itio n , i wo:. under a tta c k , both d ire c tly and c o v e rtly , a s being a pawn of in d u stry , and the p o ten tial effect of th is on certain p o lic ies and plan:; os tho Kettering Laboratory, a s w ell a s a sso c ia tio n o" s c ie n tis ts g e n e ra lly , w ith industry and in d u stria l m an ag ers, w as conrudarnbn.-,, 1 o.wiovo th e se m atters have boon se ttle d for a tim e, but l believe they a rc m erely q u ie s c e n t, and w ill rec u r. This problem in my viow , is a se rio u s one for th e fu tu re. Wot th a t it w ill a ffe c t mo g re a tly , but rath e r th a t th e co n tro v ersy c re ate d here by a man from the C alifornia i'nstltuto of Technology, and abetted by quite a numbs; of inconsequential people, plus a number who should know better, is quite capable of poisoning th e sc ie n tific atm osphere th at is so e sse n tia l in our time for dealing with the many problems of occupation and environmental health. " 1 might mention in p assin g , th at a t the American Public lizuW i a s s o c : -.,,an m eeting held in San F ran cisco , C alifornia th is pas November, two p rofessors from the Columbia U niversity School of Public H ealth and A dm inistrative M edicine reported on a 16 country * . , K? 0008323 ri.r.-iy of in immnn blood n;-: ' urine end vu o quo:/:'* ars follow s: a ;;iu J ly . do iioi support the c o n ten tio n th-ei iueroarjed nunna , c;: g-wedd...' end w ider u se of lea d in in d u stry a re cau sin g a d d itio n al own ...suv; ; v.o loud in c u r environm ent. "no significant change in load lev els of the blood and urine in the la s t teere decade:.: have boon cdown.,, u ab. p resented included lea d we-, eeoua: v ilei.:.,:,; la the h ills c.: Ike-/ ah: <u\vuy vc\.i r -- {' l... deny had blood le v e ls h in d er tie -.wiw.lO.. hidbe--ill * ... i.'waa:. bwiv loue < I* r o s . v j 4 C t ...eue . a:, te e euadeuoe iced sclubk.:u.y a u se CC.e :e:e ecu: y'.;;. ` u-,y i . ; ,, John k e e n ly ov d u e y .:: .: eev rcv .o itp ve ver cue.;; re `\V(; iX'h' rove '..ev sta n d ::.rd rn e e .o d a r d d. e k r k : e sta re , i : 1 e n d d;ef oe th e sveno g ia c c a ,, Two e ia e c e k :d. g a v e C .O f '**; i-i'=. v.'-itf; or.'.:: d'IT Ivi uvst g a v e U ., a n d 0,1.1 e y e:.,: edy e iav .cecd pee id i n d i r e m e th o d , O ne nle.ee t r e t n a v e d id r.. : , ; . v. . r c o r t e s t s h e . e. ; hide.:,: . ...;L is net very lealisti'::: os th ey hold te e c o o tie a c id , used fur l'i" ; d in e , at: the healing point for 30 min etc: w Ivo w an'd bo her'' r : 5 t:e d e .1 .{//ed th a t c o n ta in s a c e tic a c id w hich .ir: boiled fo~ 30 reunion during preparation.  Wu.Vw ;de; rU.u'Liy GUrpilsod tab.; j/twL yu , / ;, IdUVCrci O'" Ccb,.-:r e d Lead racJ.uctrieo A ssociation and y e ar lb 'scare. , O'CPClitio; V:. 1 c::.y;:n:r. coninitnicni w ould bo eufib'i to ere c vr -.ovetdotda 1 oo eiklbbbiui your. Oanecnucr.i;.yf thin inverd Luo 1 dt uucu for D innorw arc, w ill term inate on Septem ber . 1: :i Q ' o. lo only oro co n sen ted to propuro a riunirti boor l: . . rod'; i/T"-- eucciupunoinu new concupir; o'," 1 r .. w r ro d debug condition:.; c l alunno for di:uno;n . .......... .. d -1 ' 0 0 . end crocid', re on rood ro le ridilo < - ; ^ ^'7 p ,t_. *1 '.'Id -' : 1 :: |.o;. - |jg i ted-u B ^v' j loro poor nunuei; to ir. o r;; op. rovuoie. up v: ekeee owl rood r-'r j'orpyp'-; 0-. bool roierro- from concord eevurbo r o' r.ueurniutoo nprood idm l i l o o i u i bo vnw, to have nemo hi sieve 0 : b' ob roloenn from n rouuclicn cjianoo no ti.nl 013r ro e iiic n wild, be : to: nitonp an non.oi.blo w henever too su b je c t come no in povcrnrir r edicL:ne,, 1 n c q u e n lly , wo vedoh" b'- rogue::;! 0 . tree no-" cl tue : .e w e rn tio n hove the 1 .tin n er p. bestir;;. Laboratory 0 :0c. 'loci per rue ulh on production v;aro rep resen tin g each typo or giuro, in pre.U::. i f t , i.Lls tdi'oi- to is Cwi'i.j.C-1 i'jUL id" 4Sj-S y^-viV .so til: d. ilio VOUIm. or duui needed v/ili bo o b ta in e d . I am happy to t.-, m i uJl rwahr.rH agreed to c o o p erate o.n-1 l.hw th e m onthly w e ts worn .started in O ctober. Wo req u e ste d an adjuotiiicm': in the cl surge per te a t iron) Pittsburgh Testing Laboratory and they agreed to do these te sts for $15.00 each provided they could set up and run these te sts once each month. C onsequently, we have asked a ll member com panies to have the g lased cups in their hands by . t . le d : o': o u c h m onth.. Com mittee 0 -2 1 of ASTivi nos cause-; a: b to tu;m the err sergen p step s to move our dithioono procedure t:n: : a tovuaibvo s: ' s i ts an adopted sta n d a rd . We fee), th is w m ow n] to S- . $ s C u d ; - $ C O '. U t O Q[ZY(.0\ O U '"' V o : ' .m i :'JU m $ hiV\-rh.e v!.:;.idwi c ' Tue follow ing p ro g ress report w as gw re c e iv e s train : . yi>. s ; .. ? 1.00 0 0 i.n: nuuyers unrvarort^ f owwnvn: w,1enc mvcsn** e n tic e wo lira m i.big sponsoring with Lead Inausim es w soccm tcw i -- dots: cf viio re s u lts of th is re se a rc h servo to c o n .am w m nw vn.at you have long known. For exam ple, esp ecially when the research w as in itiated cad a t various tim es sin c e , v;c have run the standard te s t or Cone 3-~5 c le a r glanos ,, These dad:; sUeu m ad re le a s e v..,mes of la s s than 0,5 pppi fer these epaem an ' in a cues, r cf c a s e s le s s th an 0 . i PPrh or lo s s th an 1 p art i n t e n m iiliom l.uus die cone 3-5 clear globes, which constitute the large port cf ail ofwuiiomia*. dinnerw nre g la s o s u s e d , show very low lead reh m se a s h a ?: boon found in a num ber of other la b o ra to rie s during th e past throe decades. -6 2 - ' hmv.hdorablo c-.f.c'l: ha be?-:'?', given to in v e stig a tio n of th e e ffe c t ox c o Aor oxide end n tain a d d itio n s on th e le a d re le a s e of g la z e s , since earlier work has shown that certain additions can give an adverse reaction to the lead solubility of a g laze. D irect additions of the coloring oxides have shown the detrim ental effects of GuO especially for the low er tem perature g lazes. Also CuO should not bo used in a sta in . As you know the low tem perature copper green : was abandoned years ago. lb mere p ractical sig n ific a n c e is th e normal p ra c tic e involving iaa use of prepared com positions or sta in s , which include the ^ idwrmy oxides tar.; arc d esig n ed to be com patible w ith sp e c ific fa n e g la z e s 0.1:0. th e ir rfiauumtion, A number of ty p ic a l com m ercial means, rep re se n tin g th o se m ost commonly u sed com positions along cam the appropriate c le a r maze g la z e s , w ere ta s te d , lis u e -c i those affected the load release of the base glaze adversely showing ifmno haw;- boon w e ll-d e s ig n e d . 3 - Is w as a ls o re q u e ste d by yaaa th a t the e ffe c ts ofepaeifying oxide midi a d d itio n s bo studied,. Various am ounts of z irc o n , Sr.Oo cad TiOg, added to v arious fritted lead g la z e s , have not affected the load re le a se ad v ersely and ir. come c a s e s cf g la z e s showerm higher i.:ad re le a s e may .wove ben. m:'ai,, - Another objective w as to determ ine the effects of processing param eters on the solubility of specific g lazes. W hile the technology highly developed in this resp ect, the purpose as stated is to reda te such v a ria b le s t o 'iea d re le a s e u sin g the standard t e s t . In <v>r.*y work in th is a r e a , v?c b'\vo boon vory ranch c o po o 'c p -u v.-/-:Ji v u b ibM in individual v a lu e s ixorn specim en to specim en involving assum ed!'/ the same bisque, glaxo, and processing variables* Wo have ju st completed a factorial design experiment cb loud re le a s e in re la tio n to production p a ra m e te rs. ''h eso specim en: -.re read y tor t e s t and i t is hoped tills s ta tis tic a l approach w ill be rnrno conclusive sens.- phases cl interest have included: concentration profile ter .unci 1 . v arious type p la c e s ; v o la tility c l lea d under various oondh.iono; effects of interfacial actio n , ana relation of such cd.drse .ticns t d e p l e t i o n t e s t s . j . :;v. .<or c.,.o 't in v o lv es the d e sig n of ybucas s ; muximino two ac;.d. : mumiaoco cf the iced content, dais iu c la c e s a number of urer.uuenir.;i. com positions fired from Co:;;.. 07 In, bone 0). vouch a: . ::,.n cr bo:;ooriiue ru respect; to lead re le a s e . Wmbig sta te d th is include::: b e ra te :,, silicate:.., n o ro s ilic n to a , araah.nosii.'.cctoc, bcrculuminosiiicnLa:; cf lean , to widen various alk ali, alkaline earth, end oxide additions arc being made to cab; a more com plete understanding cf the relation. cf load release to noth composition and structure. We nope to com plete a ll th e experiment:;.: r.m . ; p bug IWdW b so m ai is under p:m>p:naticn and should bo com pleted Ward,.; the suoioe'r of !9s7,, o oo83? 3 . -. . - " ' ; , ' . J. f t w - ' .' . ... ' _ ' .. iei/i:rene':-. \ ,1*' v -'.-.'.-v-v - [ <- ' . . . ' 8 - As m entioned p rev io u sly , we could run more Dit hi?,one te s ts w ithout slowing up our experim ental w ork. So if any plant would like to submit se ts of cup specim ens, which might show trends b ecau se of v ariatio n s in com position o r production p aram eters, wo could.test such specim ens and give the plant the lead release data. This service could be given on the b a sis th at a ll the significant information (com position, firing d ata, e tc .) could and would be included in our report. The name of the plant subm itting specim ens would not be included in the report. We would very much like to have this cooperation since th ese would be specim ens prepared and fired under commercial conditions. Respectfully subm itted, ' B. W . M erw in, Chairm an y. F u rth er In v e stig a tio n s of the E x tra ctio n of Lead. From G lazed C eram ic S u r f a c e s This report describes the results obtained when a number of glazed ceramic surfaces were treated repeatedly with hot Heinz's vinegar to determine the extent of the extraction of lead by the vinegar. ' Materials and Procedures; Test #1, A single cup of each of six colors of Ceramaston' manufactured by The Laurel Pottery Co. of California was filled partially with 150 ml. of Heinz's vinegar at 100C and allowed to remain for 30 minutes as in the tests described in our reports dated July 12, 1961 and January 31j> 1962. Test #2. Cups of the two colors which released the greatest amounts of lead to the vinegar were then treated repeatedly with 150 ml portions cf Heinz's vinegar at 100C and 60 Centigrade. For purposes of comparison, three cups of each of glazes Az and Ba, from another source, which had been tested previously in this manner with hot 5$ acetic acid, were also so treated repeatedly with Heinz's vinegar at 60 Centigrade. Cups used in all tests were given a wash with luke warm Calgon solution (one tablespoon per gallon of water) between each treatment with the vinegar. In carrying out these tests the analyst first used Heinz's vinegar at 100C followed by a number of treatments with the vinegar heated to 60 Centigrade. In order to establish whether there was a significant difference between the extraction of lead at 100C and 60C, a cup of Ceramastone of a third color was treated three times with Heinz's vinegar at 60C, following an initial treatment with Heinz's vinegar at 100 Centigrade. The amount of lead removed from the glaze during each treatment was determined by analyzing a suitable portion of the vinegar by the standard dithizone procedure, as used in the Laboratory. Results: In Table #1 are recorded the concentrations of lead leached from each cup by a single period of contact with 150 ml. of Heinz's vinegar at 100 Centigrade. In Table #2 are recorded the results obtained when two glazed cups of Ceramastone, which had yielded the most lead in the initial testing program, were treated repeatedly with 150 ml. portions of hot vinegar. A third cup of a tangerine colored glaze of the Ceramastone Ware was tested first with vinegar heated to 100C, and then to vinegar at 6oC, in order to compare the quantities of lead leached out by the vinegar at the two temperatures. Included in the j' table are the results yielded by glazes Az and Ba when vinegar heated to 60C was introduced repeatedly into the cups for periods of J>0 minutes. Discussion; The analyst used vinegar heated to 100C initially, but changed to the use of vinegar heated to 60C in subsequent tests. As is shown by the data in Table #2, the quantities of lead extracted by vinegar at the two temperatures did not differ significantly. The repeated filling of the cups with hot vinegar resulted in the loss of lead at a nearly constant rate only slightly lower than that observed initially and recorded in Table #1. The testing was not continued further because of the obvious trend, which indicated - 3- th a t th e se g la z e s , them selves were in v o lv ed in a d e s tru c tiv e or d isin teg ratin g process. G la z e s Az an d B a , d i f f e r i n g fro m t h e C e ra m a s to n e g l a z e s , y ie ld e d much le s s le a d th a n th e y had in th e t e s t s c a r r ie d o u t i n i t i a l l y and d e s c r i b e d i n o u r r e p o r t o f J u l y 12, 19 6 1. The r e a s o n f o r t h i s i s n o t c le a r . The s p e c if ic cups re p re s e n tin g th e s e g la z e s in th e se t e s t s had n o t been s u b je c te d to any p r io r t e s t s and w ere employed in t r i p l i c a t e . The r e s u l ts o b ta in e d from th e th re e r e p r e s e n ta tiv e s o f each g la z e and shape were averaged in each in s ta n c e . T h eir v a r i a b il i ty may be d u e , in p a r t , a t l e a s t , to th e f a c t t h a t th e cups u se d w ere from d if f e r e n t b atch es of ware p rep ared a t d if f e r e n t tim e s. I t is o f i n te r e s t to n o te th a t th e re is no evidence in th e se d a ta of a tre n d tow ard a d ecrease in th e ra te (o r e x te n t) of th e e x tra c tio n of lead from th e se g la z e s . W hether o r n o t such a d im in u tio n w ill occur g r a d u a lly o r a b r u p tly , in tim e , i s a q u e s tio n o f some im p o rta n c e , as i s th a t o f what happens to th e g la z e i t s e l f . T his would a p p ea r to be w orthy o f i n v e s t i g a t i o n i f some m ethod o f o b s e r v a tio n , b ased upon the p h y sical s tru c tu re of the g la z e s, is a v a ila b le or can be devised. Prom The K e tte rin g L a b o ra to ry in th e D epartm ent o f P rev en tiv e M edicine and I n d u s tr ia l H e alth , C ollege of M ed icin e, U n iv e rs ity o f C in c in n a ti, C in c in n a ti, Ohio Report by; J . C holak, Ch.E. L. E r tle , D .Sc. R. Burkey, B .S c. E. P ark in so n , B .Sc. ' T able #1 The Extraction of Lead From Ceramastone (Laurel Pottery Co.) Glazes by Hot (100C) Heinz's Vinegar Glaze LN #9l8>52 -Granite LN #0183-34 -Yellow LN #0 18 3-38 -Tangerine LN #0183-38 -Blue LN #0183-40 -Cocoa LN #0183-42 -Pink Heinz's Vinegar - Blank PPM 23.3 34.8 27.8 22.6 39-3 42.2 0.012 K i 0008333 T able #2 Lead Leached O ut of Various Glazes In Successive Tests of Cups W ith Heinz's Vinegar Heated to Two Temperatures Description LN #0183-40 - Cocoa Laurel Ceramastone Test # 1 2 3 4 5 6 PPM 100UC 5oc 39.3 24.2 26.1 24.4 23.6 25.8 LN #0183-42 - Pink Ceramastone Laurel 1 2 3 4. 5 6 42.2 30.4 3 1.4 32.7 32.9 32.9 LN #Ol83"36 ~ Tangerine Ceramastone Laurel 1 2 3 4 27.8 22.0 27.0 29.8 Az - Red Harlequin Shape 1 2 3 4 0.42 0.49 0.71 0.91 Ba - Green Harlequin Shape * 1 2 3 4 0.53 0 .18 0.26 0.4l