Document 3J79gpbNE9LLM66pYo9Rjg5Vy

IfcVlMLO1* E5TAIUSHEO1902 E. I. d u Po n t d e Ne mo u r s & Co mp a n y PIGMENTS DEPARTMENT COMPANY CONFIDENTIAL D. B. HOOD HASKELL LABORATORY NEWARK, DELAWARE CO: W. S. Struve/A.Siegel Newark, New Jersey January 10, 1961 TOXICITY OP COATED MICA FLAKES RE: Letter to J.A.Zapp 12/6/60 We forward herewith "Request for Toxicity Evaluation11 covering the Ti02 coated mica flakes we forwarded with our letter of 12/6/60, The data for the carbon coated mica sample will be fowarded with a new sample of this material to replace sanple 1680-5C which we sent on 12/6/60, As we explained in our letter of 1/9/61 to Dr. Clayton, we wish to submit a sample of greater carbon content for test in place of sample 1680-5C. At least two weeks will be required to prepare the new carbon coated sample. It was agreed with Dr. Clayten that this need not.delay start of the tests on the Ti02 coated samples. BHP:dc Att. B. H. PERKINS RESEARCH DIVISION AiS,-3 BETTER THINGS FOR BETTER LIVING . . .THROUGH CHEMISTRY N37261 K-130O4 E, l. d u Po n t d e Ne mo u r s Si Co mp a n y PIGMENTS DEPARTMENT CC: I, J. Krchma/W. A. Jenkins * Wilm. W. S.Struve/A.Siegel, Newark J. H. Cooper, 15 COMPANY CONFIDENTIAL Newark, New Jersey February 3, 1961 DR. J. W, CLAYTON, JR. HASKELL LABORATORY NEWARK, DELAWARE TOXICITY OF COATED MICA (MR-582) Confirming our telephone conversation of February 2, 1961, we wish to have the toxicity tests run only on the carboncoated mica sample and the mica control. In accordance with our agreement, we have changed the figures on the copy of Medical Research Project MR-582, Part I, which is being returned to you via our Wilmington Office. The new sample of carbon-coated mica, referred to in our letter of January 9th, on which we wish the tests run, will be sent to you on Monday, February 6, 1961. BHP:dc K--H. PERKINS RESEARCH DIVISION BETTER THINGS FOR BETTER LIVING . . . THROUGH CHEMISTRY N37261.01 DU P050041350 \ \ \ DUP050041351