Tom, my reasons are the same as Francesco's.Originally Posted by Francesco
I have componded all the components of PPPD as long shelf life stock concentrates.
I have also succeeded in compounding a concentrated Amidol stock solution (I made a new batch Friday). I dissolved 24 grams of Amidol in 1 liter of hot (220 F) Propylene Glycol. This was done under a vented chemical hood with a hotplate/magnetic stirring bar combination.