I am 50 now, worked in a Camera Store/Studio in Southwest Michigan in the 70s-80s.

Does not anyone here remember the supposed government spraying of farmers fields with Paraquat? At that time I heard on the radio that film developers such as Dektol and D-76 contained Hydroquinone, which could be used somehow to "detect" the presence of Paraquat, thus letting the "hippies" know if their pot had been contaminated. I remember the quote "check your pot for Paraquat".

We actually had a few people come in to the store that were not regular customers, only buying powdered developer for a week or two.

Craig Knapp
Shooting with
Franka Rolfix 6x9 (with Series VI filters)
Franka Solida IIIE (by Certo 6)
Kodak Retina IIIc with 3 Schneider Lenses (body repaired recently CLAd in Aukland Newzland)
Bronica ETR-S System
Omega 45D 4x5 system
Complete Wet Darkroom with Beseler 45MCRX and 23CII