Document RJEQzaQ2GErM45gq2aL7R0njz

> .K*3fl!&4::V- UTAIUSHCOteOZ E. I. d u Po n t d e Ne mo u r s & Co mp a n y INCORPORATED PIGMENTS DEPARTMENT DMf CC: I. J. Krchma/W. A. Jenkins, Wilm. .S.Struve/A.Siegel, Newark J.H Cooper, Newark Newark, New Jersey February 7, 1961 COMPANY CONFIDENTIAL J. . CLAYTON, JR. HASKELL LABORATORY NEWARK, DELAWARE ,.*> _ cf^. 1%^ TOXICITY OF COATEDMICA FLAKE PIGMENTS Re; My letter of 2/5/6I A 100 g sample of carbon-coated mica flake has been sent to you today via parcel post. The material, coded "1680-54 . L1L2L3 Composite", is the new carbon-coated sample for the toxicity tests referred to in my letter of reference and^ replaces an earlier sample 1680-5C of lower carbon content. As agreed in our recent telephone conversation and stated in my letter of 2/3/6I, toxicity tests are. to be run only on sample "1680-54 LiLale Composite" and op the mica control. The "Concord 200/325 mica" sample sent to you on 12/6/60 is the mica used in preparing the carbon-coated pigment and is suitable as a control. BHP:dc A- / B, ,H. PERKINS RESEARCH DIVISION */ BETTER THINGS FOR BETTER LIVING . . . THROUGH CHEMISTRY j:/ c N37262 /1 DUP050041353