THE EXTRACTION OF LEAD FROM GLAZED CERAMIC SURFACES The occurrence of lead poisoning, from time to time, as the result of the use of certain types of glazed ceramic ware in the household, has led to several Investigations of the extractability of lead from ceramic glazes Certain cases of poisoning have been due to the use of ware in which the lead oxides had not been "fixed" properly, for one or more reasons, such as unduly low temperatures of firing, or insufficiently prolonged periods of firing, or the formulation of glazes without sufficient consideration of the problem of solubility While responsible persons in the majority of potteries are aware of the technical and hygienic problems associated with the use of the lead oxides in ceramic glazes, and employ proper techniques for "fixing" the lead, no comprehensive investigation has been made of the extractability of lead from representative items of dinnerware in widespread use in the United States,, Accordingly, the UPS., Potters Association has set out to obtain such background information by submitting to the Kettering Laboratory for testing, representative ware from a number of cooperating potteries Another objective of the investigation was to devise or select a test to serve as a stanaa.ro for future control purposes.

Untreated steel wtndowframes might well be coated with another high lead primer based on red lead.

None of th ese protected m en have ever suffered lead poisoning.

Dyer's condition, but it is decidedly to our mutual advantage to know at this time just what quantity of lead is be inJ.; excreted.

Silbiger, M.D 2 February 25, 1963 or products, the 'size of Its population (from the aspect of exposure to lead), your experience to date, if any, with cases of actual or suspected or alleged lead poisoning, and any other Blatters which you think would be helpful to toy Interpretation of the situation.

Sander had ventured the opinion that silicosis will virtually dis appear in the next 25 years, you felt that you could say that this would not be the case with lead poisoning, and that you believed that plumbism is as common in industry today as it was in much earlier times.

Steoher this morning, in connection with prepa ration for trial for a case of lead poisoning.

Salth also reports on a follow-up of children's lead oases and In --lch 00 cllnloal ahnomalltlaa --ra found la uxsoapllcsted poisonings after fle yaara.

Just yesterday I presented his case to the students at the school, and we had a very interesting clinic on lead poisoning.

However, I have been involved with there children in Lead determinations and in consultation' with pnysicians in the General and Chilurer.'

Kehoe;- I have just heard from our reviewers who have been reading the six articles on lead poisoning, which you sent to us for possible publication in the Journal of Industrial Hygiene.

Maroon, Tleo-Frooidont, Hatlcnal Lead Co,, 111 Broedty, Hoa Tort 6, M.T. (5,6,7,8) Mr.

Buenos Aires, Argentina Dear Mr* Roberts i Shanks fo r your le t t e r of June and fo r i t s information concerning Ch ile, Brazil and Venezuela* I wrote Dr* "eis3 some tiras ago, acceptin g h is resign ation with r egr et but suggestin g that i f he fouhd i t im possible to continue in h is work, th at he might return to you the volume with a r t ic le s on lead poisoning for your fu tu r e use for h is su ccessor* I hope the sit u at ion is S3 you su ggest , namely th at Dr* Weiss has resign ed merely because of in ac t iv it y , fo r in that event he w ill probably be w illin g to resume h is r elat ion sh ip with us i f and when the com er cial sit u at ion ju st i fi e s i t * That would be the id eal solu tion of the problem* I f you have occasion to see him, I hope you w ill assure him th at I do not want him to return the book to you i f he r e ally wishes to keep i t * Concerning the a r t ic le which you enclosed with your le t t e r , i t i s scar cely fa ir to say th at i t i s a comprehensive statement of the sit u at ion and th at i t shows a very profound under stan din g of the problem* In fa c t I should be disposed to think th at It is the work of a somewhat dogmatic and somewhat inexperien ced person* Although most of the fa c t s st at ed are e sse n t ially cor r ect , the emphasis is d ist in c t ly in cor r ect ly placed* You may fin d th at the two auth ors of t h is a r t ic le are qu ite well informed and th at they w ill bo able to put you in touch with a sat isfac t o r y con sultan t fo r u s, but I suggest th at you go rath er slow ly sin ce I 3hould prefer to have a soundly train ed doctor with no preconceptions about the problem than to have a somewhat poorly informed person who st a r t s out by regardin g h im self as an expert in t h is fie ld * Sound Judgment with r esp ect to lead exposure i s based only on experien ce, and I should be very sk ep t ical as to the wisdom of engaging a man who knew the su bject only from the lit e r at u r e 2 and had not had su ffic ie n t experience to temper h is judgment.

I expect to spend the greater part of my. scientific life investigating the problem of heavy m^,tal poisoning with special reference to lead* Very truly yours.

'- ' 'In my opinion the man has huu an attack of.acute lead poisoning, from which he is now in a receeding or convalescent stage.