Re: Alkaline fixers and lumen prints
Christina Z. Anderson
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In 10 tests on 10 different papers some papers looked about the same with both alkaline and acid fix (and stabilizer). Many were slightly darker and slightly more reddish in tone with an acid fix aka Sprint.
There was not one case where I preferred the alkaline fix or where the alkaline fixer should be required.
But the real surprise was this paper which is either Bergger VCCM or Forte, can’t tell—two envelopes in one box unlabeled, but I will have a separate piece of each from their own packets this week to test.
The alkaline fix is on the left and the acid on the right with such a marked color change. It may not show in this image but it’s a beautiful purple.
How I conducted the test was one piece of paper with two step wedges on top, exposed all day sun, cut in half just before fixing, fixed in two separate trays for the same time.
It is probably not possible to make firm conclusions with all things lumen, but for me an alkaline fix is no longer. Two other people are also testing and we’ll see if this is consistent for them, too, so it’s not just me.
I can’t discount that there is something else in Sprint that accounts for such a color difference.
Sprint Record Fixer
Ammonium Thiosulfate 80-90%
Potassium Tetraborate Tetrahydrate <10%
Potassium Borate <10%
Potassium Acetate <10%
Sodium Metaborate Dihydrate <3%
Sodium Sulfite <2%
Sodium Metabisulfite <2%