Zinc sulfide, not less than 99.8 percent.
Copper, 100±5 parts per million.
Lead, not more than 20 parts per million.
Arsenic, not more than 3 parts per million.
Mercury, not more than 1 part per million.
Cadmium, not more than 15 parts per million.
Do not use in the area of the eye.
21 C.F.R. §73.2995