Phenidone A stock solution

[david_lyga]

<p>Please tell me which is better to store Phenidone A: either in water with sodium metabisulfite or in 91% isopropyl alcohol. Does it really matter? Thanks. - David Lyga.</p>

[User_502260]

<p>When I mixed up PC-TEA the phenidone had to dissolve on standing. Once in the TEA it might last forever. What developer are you making when you store it in either of these?</p>

[david_lyga]

<p>Only the metol / ascorbic acid one. Substituting the Phenidone A for metol.</p>

[john_stockdale2]

<p>I have tried 90% ethyl alcohol (the sort we drink) and it was a dismal failure. I have read that the presence of some water in alcohol is very difficult to avoid.</p>

[jay_de_fehr]

<p>David,</p>

<p>propylene glycol is a better option than either water or alcohol. When I was eperimenting with developer formulation on a regular basis I kept stock solutions of the agents I used most often, and it made my work far more consitent and convenient than weighing out dry chems for every test batch I made. Once I set up for it, I was able to compound and test several variations on a given theme in a night's work. Phenidone and ascorbates seem unusually unstable in aqueous solutions, but last forever in glycol.</p>