Just a note of caution. In many countries (don't know about the US) this stuff and potassium dichromate are restricted substances as they apparently find some sort of use in the preparation of illegal drugs. The dichromates are also strong oxidizing agents and can react violently with reducing agents. Ammonium dichromate can easily catch fire (there is a well known lab experiment that demonstrates this) and can explode in a closed container if heated. 2Kg is more than enough to do some damage given the right conditions. I'd be a bit careful who I sold it to and how it was transported. For what it's worth OzJohn.