Here's the latest on an old question: do fire retardant airdrops create harmful contamination of burn morels?
This is completely different from the prescribed fire question I have been trying to answer: does helitorch fuel leave behind toxic residue? Its basically gasoline mixed with a phosphoric acid gelling agent, Phos-Chek Flash 21. Does anyone have any experience with the stuff? It's supposed to be safer than napalm but, imho, that's not saying much. I can't find anything on what sort of residues get left behind by helitorch operations.
https://modern-forager.com/fire-reta...commendations/
https://www.fs.usda.gov/sites/defaul...ROD-Signed.pdf