Chromium in 2% NaOH extract, not more than 0.075% as Cr2O3 (based on sample weight).
Arsenic (as As), not more than 3 parts per million.
Lead (as Pb), not more than 20 parts per million.
Mercury (as Hg), not more than 1 part per million.
Cr2O3, not less than 95%.
21 C.F.R. §73.1327