Quote Originally Posted by argentic
Hi PAt,

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.

I tested several developers in propylene glycol, dipropylene glycol and glycerine. The characteristics of the developers were affected very little, if any, by the solution.

However, glycerine is very viscous and I found this to be something of an inconvenience in use as it made precise measuring more complicated than with the two glycols.