Food and Drug Regulations

B.06.043 [S]. Ponceau SX shall be the disodium salt of 2-(5-sulpho-2,4-xylylazo)-1-naphthol-4-sulphonic acid, shall contain not less than 85% dye and may contain not more than

• (a) 0.2% water insoluble matter;

• (b) 0.2% combined ether extracts;

• (c) 1.0% subsidiary dyes;

• (d) 0.5% intermediates;

• (e) 3 parts per million of arsenic; and

• (f) 10 parts per million of lead.