Re: Up Glyoxal!

nadeaul@nbnet.nb.ca
Tue, 29 Aug 1995 20:56:03 +0300

>For the "control" with formaldehyde I had to decide whether to use my
>usual 15 cc per litre, or same 25cc per litre (as is recommended in some
>books, not others). Decided for "science" to use the 25 cc. Must here
>take back everything I said about the formaldehyde not being so bad
>outdoors. It was a very still, hot day, & I thought I'd faint. SO GLAD IT
>WAS THE LAST TIME. THANK YOU MIKE & JOHN! (Odor still noticeable in the
>dry paper next day, too.)

Not only that, but freshly formalin hardened papers can completely fog
single transfer carbons. That is when used for the single transfer carbon
process, where the exposed pigmented paper is developed right on the
surface of the (formalin hardened) final transfer paper.

>And the good news is -- samples of two of the 3 papers I did stain
>test on (using a very stainish ultramarine blue)

something is missing here. You put the blue pigment in the gelatin?

>developed whiter with
>the glyoxal. Yes, whiter than white!! A third paper was about the same.(The

There are excellent pigment printing books on the market that explain why
blue pigments can make some materials appear whiter than white;-) The same
can be said of optical brighteners in general.

Luis Nadeau
NADEAUL@NBNET.NB.CA
Fredericton, New Brunswick, Canada