If you look at it closely enough you will see that USPS will actually allow you to ship pretty much any photographic material, even Pyro and other nasty stuff, and it would be totally legal, with no paperwork or license or fee.
Exactly, that's the point I was trying to make. The form, quantities and packaging of chemicals that photographers are dealing with are usually OK to ship even when some of the component materials are considered restricted or dangerous. Trying to figure out all the regulations is difficult.


