In following ILford's instructions for archival processing of FB prints, is ten minutes in hypo clear the same as ten minutes in wash aid? Kodak reccomends a shorter washing time in hypo clear and then a longer washing time in running water, in relative comparison to Ilford's instructions using wash aid. Does it matter, in other words are they interchangable, chemically the same?

-- Paul Swenson (paulphoto@humboldt1.com), August 31, 2000

Answers

Pretty much.

I use Heica Permawash. Again very similar, I have just had more recommendations for Permawash.

-- Terry Carraway (TCarraway@compuserve.com), September 01, 2000.

I don't know if they are chemically identical,but they all do the same thing.Time is not that critical,it's up to you,depends on how well you want your prints washed,your water supply and water temperature.I always wash much longer than manufacturer's recommendation.Like the other poster,i use Permawash.And so does ICP and New School Darkrooms,and every photographer i know personally.

-- Cem Topdemir (tacuma@earthlink.net), September 01, 2000.

They are almost certainly chemically very similar. The basic ingredient will be sodium sulfite. This does ion-exhange with the thiosulfate. Many other substances could be used, but sodium sulfite is cheap and safe. A second ingredient will probably be included to adjust the pH.

One formula: 200 g sodium sulfite, 50 g sodium bisulfite per liter of water to make a stock solution. Dilute 1:9 to make a working solution.

-- Michael Briggs (MichaelBriggs@earthlink.net), September 02, 2000.