I've just purchased glyoxal as the hardener for gelatin sizing. The stock
I obtained is not colorless, but amber. Is that OK? Will the sizing take
on the color and be left on the print? The salesman told me that this
color is normal in aging. The stock I have is two years old, but has a
ten year shelf life. He said he would take it back if I didn't feel ok
with it.
Is the highly toxic mercuric chloride really necessary for storing the gum
binding solution? How long till bacteria and fermentation set in?
Ron