gainer said:Safer glycols
I found an auto supply store that had the safe propylene glycol antifreeze. It worked as well as the ethylene. Another benign solvent that works is glycerol (glycerine at the drug store), but it is very viscous, even more so than HC110 syrup.
could you elaborate a bit more on glycerol (glycerine)? This is a ready available substance here in Europe, and AFAIK it's the least toxic of the glycol / TEA family. If it practically works as a non-active developer solvent, it would be an ideal candidate for a very environmentally friendly Phenidon - Vit C developer.