There is a chemical supply company in Toronto that has many items for
alternative photographic processes. They are a small, very helpful
organization. A few weeks ago I purchased sodium dichromate from them.
Their address is:
Nymoc
24 McGee Street
Toronto M4M 2K9
Phone: (416) 465-1929
They don't have a catalogue. Call ahead for prices and placing your
order. If you're in Toronto, they are several blocks east of Vistek
Camera, half block south of Queen Street.
ron silvers