Response to Catechol-Metol

Ah, I forgot, when you disolve the pellets you will generate heat, so be careful! Yes the other compounds you mention come in many different hydrated forms and also in anhydrous form, but not the sodium hydroxide. Now sodiu hydroxide is hygroscopic, so it will pick up moisture from the atmosfere if you leave the jar open too long, so open it, weight what you need and then close it again, and you should have enough to last you for many, many gallons of developer.

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