Sold!
When i order from the formulary. they ship everything with USPS. I doubt they are engaged in large scale criminal activity.
There is nothing wrong with shipping liquids (and after all any liquid is a chemical at the end of the day) as long as they are no prohibited.
As far as i can tell there is nothing prohibited with PMK, or any other photographic solution. So says my postmaster, but since she gets so many other postal related issues wrong i do not trust her. just what the law actually says.