A reply on an old thread, tossed mainly to Photo Engineer:
I recently mixed a batch of FX-10 using CD-2. The newly purchased CD-2 was brown, and when added to the sulfite solution produced a nasty brown oily tar that ruined a PVC graduate and stir rod. I assume the CD-2 has oxidized, though the vendor says it's good and fresh. Knowing little about this chemical I was wondering if you could verify. I read elsewhere online that the solid should be white.
If there is some other caution on mixing that I should know, send it my way -- temperature, pH, etc.