HT-2 Hypo Estimator Query

Photo Engineer said:

As for test results on different papers, well, they fix at different rates and wash at different rates. RC washes far faster than FB paper.

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Archival fixing/washing was a lot harder to achieve with acidic Sodium Thiosulfate based fixers and has gotten a lot faster and easier with modern near neutral rapid fixers. What Raphael considers a "quick wash" might indeed be archival for certain fixer/paper combos.

Hello,

Rudy, PE, thanks again for your replies.

I use "modern" thiosulfat ammonium fixer diluted for paper (1+9), and let the print fixes for 2 minutes (for FB papers). The fact that the Fortezo heavy paper, Museum weight (280g/sq. meter !), would be easily washable, is rather counter-intuitive to me ! But I have to make further tests...

So, on advice of PE, I decided to discard the HT2 solution I made.

Maybe I will try to make cheeseparing economies here, but is there a mean to salvage the Silver nitrate in solution ? If I dilute the solution with distilled water, and let it evaporate in a crystallizing dish (possibly in darkness, not under the sun !), can I obtain silver nitrat crystals, or it is permanently destroyed by acetic acid ?

Best regards,

Raphael

Guys;

FB paper absorbs much more chemistry than RC, and the baryta hangs on to hypo-silver complexes. So, FB wash times should be longer than RC. However, FB wash times vary more from brand to brand due to the larger variations in the nature of the FB material and the baryta coating. There are several sources for these paper supports in Europe.

PE