Ammonium dichromate is also known as ammonium bichromate. It is an orange solid with a density of 2.1. It's uses include - mordant for dyeing, pigments, oil purification, pickling, manufacture of catalysts, science demonstrations, leather tanning, synthethic perfumes, photography, process engraving, and lithography. Packaged in a high density wide mouth polyethylene jar. This material is shipped in compliance with USPS Publication 52 as an ORM-D. Shipping .50.