I have mentioned on several threads that Dimezone, Phenidone, and ascorbic acid will dissolve in glycols or TEA at room temperature if one is patient. What I recommended was putting the developing agents and glycol in a bottle and gently shaking it periodically until the solids dissolve. The bottle can be gently warmed, say to 50 C, during this process to speed solution. If one uses a mixture of glycol and TEA then the TEA should be added after the solids dissolve and the solution has cooled. I have used a 1:1 mixture of glycol and TEA in the final concentrate.