I've been making up concentrated ID-78 for over 20 years now and never had a problem. You can replace the Sodium Carbonate with Potassium Carbonate & Potassium or Sodium Hydroxide which allows far greater solubility. Assume Potassium Carbonate (anhyd) 12 g + Potassium Hydroxide 4 g is approx equivalent to 60-62 gms Sodium Carbonate (Anhyd).
The alternative is make a weaker concentrate. My darkroom never falls below about 12-14°C so crystallisation of any developer is rare anyway.
Last edited by Ian Grant; 01-20-2009 at 03:05 AM. Click to view previous post history.