Never heard of it before. I'm sure it's nothing important. Definitely nothing to do with a precursor to every powder and primer in every cartridge out there...I'm sure it's more of a DOT safety thing on account of all the 'wet nitrocellulose' trucks that have been blowing up recently.
Smug, and almost grotesquely uninformed comment, that.
This has been brewing since fat Ted chaired the OSHA committee, and though beaten back, was NEVER taken off the table.
GTC