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OCR Page 1 of 2May 26th,1930.
Dr. James E. Ives,
Treasury Department,
United States Public Health Service,
Room 1-123 Bldg.,
16th Seventh St. S.W.
Wash. D.C.
Dear Dr. Ives:
In answer to your letter of May 23rd, I am glad
to advise you that we manufacture several different grades of
luminous material. The only difference in these various grades
is the amount of radio-active materials they contain. The base
material in all instances, namely the phosphorescent sine sulphide
is the same.
The radioactive paterial is incorporated with the
phosphorescent zinc sulphide by wetting the sulphide and adding
the radium, as the chloride or bromide, after which the radiun is
fixed as a sulphate and the sixture dried and screened.
I trust that this gives you the information desired.
Sincerely yours,
Vice President
HHBarker: RH
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