I received some propylene glycol yesterday to make a longer-lasting stock solution "A" for Pyrocat HD developer. All of my chemicals were purchased from Artcraft Chemicals, and I've had no problems with them in the past using water to create the stock solutions. The water-based stock "A" solution ends up being a light tan color. This time, putting up the catechol in heated propylene glycol produced a vivid and deep reddish-orange colored solution. Have any other users noticed a difference in color between glycol- and water-based stock "A" solutions? I have not developed any film yet with the glycol- based stock, as I'd like to know ahead of time whether this color difference is indicative of a problem. Thanks for your help.
All the best,