Document p6z4YpVpN3V1oeR2rmk2w3R7

- <Z:\ i. . % .< ;v v /*m How modern methods have reduced - ' manufacture of this prime pigment 1)'" ' V*' from four months to three days o.rvV^ EAD hu been termed "man's L moat precious metal,'' although at first glance such claim may seem far from justified. However, down through the centuries lead has proven to be of ranking ink portance in ail civilizations of later date than the primitive stone ages. Today it enters inextricably in.to '. the fabric of modern life. It is used in the storage battery that powers the automobile; it forms an essential part of the protective rovering for., trans-oceanic telegraph and tele- . phone cables; it forms the glaze of ' pottery and china; it protects the patient and the doctor from the radiations of the X-ray machine and it has a host of other uses. Not least among these other uses is its importance in paint, manufac- . tune. For from lead comes the most widely used white pigment of all-- white lead. And the protective coatings for bridges, for railway rolling stock and ior countless other metal objects subjected to the hazards of corrosion are made from yet another derivative--red lead. As A.Pigment ` White lead is undoubtedly the most important pigment .of white' and light colored paints. It has been - known since the early Greek eras and has found a place in nearly all civilizations since then. Today a ` large proportion of Canada's annua] production of 176,000 tons of lead is exported, while the most impor- 1 tant domestic use is in the manu-. tacture of white lead. ,, White lead is the whitest pigment - in general use--the only pigment , n , which is more white being titanium. ' However, white lead possesses characteristics that make. it more ' . useful- for certain kinds ' of paint" than titanium. It lasts much longer . - for one thing,. and' because it is. . Canadian.Pa'ml, and Varn'uKMagazine, June, 1950 0007-SWP-043307 N23181 W&tf&fk:*si;*. *.*/ -;.' utOMnaiinaHMru % mm, a v ^v ; t?*: iX/'i -* ..'<* *,k.v> . -w ^.chemically it ` react*. .with - :\ '-oils of the paint film to form-a : `hanler'oovering. ;< ; \ White lead is a carbonate of lead,; _t '. in; the past its production^ has .. . a; slow, process,' with little " ' - 'change: for many, years. .The oldest ` wn i method of.> manufacturing to bury lead metal in a manure * l. 'pile,fwith-vinegar'or'wine. It - Is -j .- ' doubtful if'they knew exactly how,' but they produced white lead.; The'.. ^ win? or vinegar reacted with1; the - ' lead,to iform lead acetate. .This in., turn;:reacted- with carbon dioxide ., kformed by the fermentation oftthe ^S^manure,', forming. white lead.. The >. If method was slow -and ;'the product . ^ . This slofle orlinder, 97 feet lour; cnU process time from eight lo three ^ - days at Carter White Lead CCompany. i>t. .u Earlr^Dtttch froeea \ Next step in the history ot white '* C *' V/lead>manufacture ..was the Dutch f ^ ^ process. Here similar chemical re al.-,r.* .C- v- Aactions were anpnplied on a egrander Operator here is aft control panel at discharge end of "long cylinder'* which allows continuous-flow production. ^scale and with better control, of wjjJ quality. Into earthenware,pots some. ; white crystalline substance. This Vi! what similar to ordinary Dower 1 was white lead in the rough. The rH 'V.'tf'pota was placed a number of circular acetic acid, acting on the lead, had 'v, 'buckles' of lead metal--thin plates, . formed lead acetate. This then re d *V.5 of lead about eight Inches in dla- acted with carbon dioxide formed 5 , v. meter; These buckles were punched . ' by the fermentation of the' tanbark *^with' a number of holes. In the to form lead carbonate, o t white ; * - * \J: bottom of the pot was placed a lead. The buckles were then dumped TiHjj J' *\\ ti svmmnaIlIl a mmnoiurnn)t fotP acetic Dafctii^d7 f(fctMrurd/1e from the pots, the crystals broken .'*x;," if/: vinegar). *\\m A layer of pots was placed in a i'.s<luare kiln-like structure cailhd a off and ground to -a powder. 'White lead produced in this way was of , better quality and economical to .; , i.j y. ' stack.- Over the layer of pots| was produce, but the process was too , `/;]aid * covering of tanbark (the bark slow. , 1. . ^ '1 * i;-.I the oak tree after extraction ol Next to he introduced was. the fc'.r ;/tannic acid), then another layer of cylinder method, whereby metallic '` .......................................................... lead was atomized and the resulting , , powder blown into wooden tanks laid on their sides. While the wooden. cylinder slowly revolved, water and acetic acid were sprayed in. Then 0007-SWP-000126654 White. `^Continued from page 11) v3*e#r^A*ft'er^fiver' daysv. o.-f'WthiSs' ir./. Cpfrocessing-the reaction was partially ^completed, but. some 'metallic lead*;" Kgrtmained,*The unconverted materialiwaswashed out and the'partly fin-V~ Hshed; product.-?went .back m the ^cylinder forvanother s three days to J' ^rnplete the reaction to white lead.jv^ ^White.^lead * plants `at*, this stage-';* "Je'onsisted of-large batteries of these ^wooden cylinders slowly revolving ^ .. ?and subjected to the sprays of acid, J^water and. CCk Many white lead * ^plants of today are of this type, i, #: Finally, today there is a process * t h ^Whereby metallic lead-is converted 'to white lead within three days, m continuous "process and with a t *] r^vquality control quite unobtainable I S^with, any of the older methods. In./. "I ^Canada, production has just begkn ^ |^'byj this-new process at the Carter./ - White - Lead Co. Df Canada, Ltd.*; jjj^1 plant at Montreal, after an exten- kRp-,C'sive expansion and re-equipment. Ig5& At the Carter plant white lead manuf3cture has reached the limit - - of modern refinement. The cylinder 5 method has grown up, until now one * machine does the work of perhaps % *50 of the older ones,-and at the^ . >same time with a significant in-;. , ' crease-in quality control A 'Tongi'.`| /*J' "' !W; --v/ Ti'-'.-i sm&timg Q&t p cp r-^vV.:/'W/vVii (i/^r'-/. n fb\,>'/n:i! nKK> {pji i'o "w 0 t.1 \J u li Vj b \j \_`^3 ij~> ,'/7* 'vVl'jT','^1. P;[O^ fC5sn?.*iro{0 rf!^ e u k> J if v * ' v, '*' L v \l J t-' w u J w & \ 'j $ vi/; c f-H rOr"^ * \* -.1 J U . *' c*/r ' '/f jl..; u Ii ' t?L J . j - .t I; I aULCMPT PAINTS LIMITED 313 Symiinjjtoa iive., Toronto, Ontario cylinder/' built to exacting specifi the temperature and the quality and . cations, has just been completed. It quantity- of the acid and carbon, is the only one of its kind in Can- dioxide affords minute control over sda. the final composition of the white... Into one end of this machine, lead.- ; -, which is six feet in diameter and When the white' lead leaves die ' 97 feet long, is poured a continuous charge of lead. Three days later white lead emerges from the other end The age-old chemical reactions long cylinder it is in the form of a - slurry, or soup. In the preparation. ; of either dry white lead or lead-m oil, the water must be removed. , , ' which take place have not changed, , For dry white lead.the slurry ft -\.' but secret process refinements and .passed through a vacuum filter1 r ' mcticuibu3 electronic controls result which removes approximately half *" }t in a product of exceptional quality . the" water and results in a cake. This ,. f*Thjs control* of the reaction rate,^ .filter cake is then scraped from the. y^>i^b. y-- ^*.- fj,,S/*.y. .*fri. ;yr,;.[ ... -j * v:` \>X: / Z.& Si , - WJ`if. , -A , Z\ \\ ' S 0007-SWP-043309 0007-SWP-000126655 :S*mi`*k im, tm \MmL' mi m .-; fi-' !'&, IRON BLUES ENGLAND available in Canada j|Pp; w^T^'-y!y-;--'' - -r,-:_____ - ^^^^tlkLfTY BLUES FOR'-"'"'" '". - [riivP;y5iJ<Ji'...-, a . , - ,, -v v v .;j s V, ,' ,^^'v^#>lH/omo6iIe Finishes . '- Chrome Green mannfaeinrc K&m' kx\Cinbleum ,; iV ::>: Carbon Caper *i V>?,- ' ; iv '-V N"-- grieves me to see an array of cont^Sj *' dietary color elements on a shell,'* he said. "If I am in search of a can of pale green enamel, for instance, I may , be upset by the kaleidoscope of color on the shelf. Some labels may be so cluttered up that one can see nothing."' Because color was, in reality, "the essence of life," Mr De Vita recom mended children receive instruction an its correct use at an early age He sug gested paint manufacturers would b<x performing a useful educational serv ice if an elementary booklet on color harmony be made available lor those m formative years "Color is the very essence of life today," he declared MWe may speak of color as a pvgment, but we have color In personalities. We have color on the stage, but the actor, too, must have color The child of today who learns about color harmony will be the housewife of tomorrow That is a thought we should all keep uppermost m mind." Formal announcement of the annual Toronto Paint Club, golf tournament was made by Dick Young He said it would be held at St George's Golf and Country Club on June 23 Members may "start their spring .plowing be tween 12 o'clock and 2 pm," he said Mode Sales Manager HARDMAN & HOLDEN LIMITED :<MANOX'[ HOUSE,' MILES' PLATTING, MANCHESTER 10 ENGLAND t PATERSON * , TORONTO S. ONT., CANADA v HELD FOR ittUEDIATE DELIVERY iTM Mat wi ad yeti rmpl* uHabl* for your particular need*? 4 . IT - - ', filter r arum> and passed through a for the oil, the two coagulate and drying .'tunnel. , Temperature and drop to the bottom of the tank. The iate^ of-, passage- are so controlled water is drawn off the top and the ithat/thtf* resulting, dry white, lead' lead-oil paste remaining is then contains'-less- than"' .15% water and- ground in special high-speed roll I'^drier'than'' the atmosphere. It is ithen ground and packed in bags and jdruins^n'We, wouldn't', suggest that mills to form the finished lead-in oil of common use. _ _ HARRY..VAN ZA.NT_____ ,, it/ itself. When it is exposed to a hot ig swells up to form an insulating mat, ~o^'attempt'to lift a drum of white llVjEvenijjthough it is less than Color Essence of Life t from penetrating to the inflammable ath, and at the same time halts flame rShe'< size-'of, atgasoline barrel, , Says Package Authority there is no fuel to burn. (fig. 1) inifulli Htweighs 600 pounds I raetors ore finding these paints specified 'UntTu^nfrthi ryeVt; ^r ofVvTf 7'" "" SEornwl . home and in the store was stressed by . os*` an(t '^le amount of iV'. '.feAIiV.'. 'S. *'V' V;*, i'anadum Feint and Varnish Magazine, June, 1950 1* - ' V ; " .* - / GO07-SWP--043310 0007-SWP-i