Arista Liquid Film Developer Issues
Posted: Sun Sep 05, 2010 12:11 am
I recently purchased a 64oz bottle of Arista Liquid Film Developer (Clayton Chemical) for my photo I class. I mixed the half gallon concentrate 1:9 for stock solution. My students developed several rolls of the same 35mm Arista 400iso film using the "stock" 1:9 solution. Some rolls turned out just fine but some rolls look underdeveloped. My students swear their temperatures (20˚C) and times have been consistent. Although, I assumed that the word "concentrate" meant I could mix the entire bottle (5 gal) to a "stock" solution, so my students would not have to worry about measurements at this point. I am wondering if this so called "stock" solution is really a diluted "working" solution, and has simply exhausted in a period of 7 days. Please tell me this is simply not true. I plan on doing some clip tests tomorrow. I store the developer in a refrigerator @ 11-15˚C. Thanks.