Canton Laboratories Pvt. Ltd. Offers Activated Carbon USP. Canton Laboratories Pvt. Ltd. Has been accredited with ISO 9001-2000 certification, manufactures Specialty High Purity Chemicals, chemicals and bulk drugs. The Activated Carbon USP is also known as "Activated Charcoal" comes in fine, black, odourless, tasteless powder, free from gritty matter. The Activated Carbon USP is practically insoluble in all usual solvents. The Activated Carbon USP has residue on ignition of max. 4.0%. The Activated Carbon USP has heavy metals of max. 0.005%.