Re: was Miracle size for gum now tonal range
That's an interesting bit of information. I tried once or twice to clear (in 5% sodium metabisulfite) but it didn't made a difference - at least one that I was able to perceive, therefore I left the practice. Perhaps the extra darkening I get isn't as strong as those people were experiencing back then... BTW my exposure times aren't that long, 3 - 5 minutes with 5% AD under UVBL light and Pictorico (old original stock, not new stuff) media. For comparison, my standard exposure time (using the same transparency) is 6:30 for 2A(20%)+1B(8%) trad. cyanotype and 16:30 for 1A(25%)+1B(12%) trad. cyanotype. (As a side note: I like the darker tones I'm able to get with the new-to-me formulation but the printing times are annoyingly long as you can see above...) Regards, Loris. 2009/10/10 Christina Z. Anderson <zphoto@montana.net>: > ... > FWIW I never clear, only step wedges when I am trying not to get a false > exposure read. But it's funny because at one point in the late 1800's > people were panicking because their gum prints faded over time and found out > they were relying on the dichromate stain in the shadows to provide some > print density when, in fact, over time in sunlight it does bleach to a pale > sage green.
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