For the gelatine in gumprinting i use glyoxal; just for the arabic
gum (and the rabbit glue - both are amounts where 3 drops per 100
ml isn't a lot) i use the formaldehyde (37%).
In the pharmacy i ask for something like 20 ml, and when i try to
explain things like 'to preserve arabic gum ...... print
images ...... dichromates', they look blank and their problem is to
calculate what i have to pay :-)
On 30 mrt 2009, at 18:29, Judy Seigel wrote:
Henk, do you have the trouble getting formaldehyde in Europe/
Netherlands, etc. that we have in the US ? I suspect it was
because it was (allegedly anyway) an ingredient in making crack or
some other illegal intoxicant, but it was ixnayed everywhere in the
US except by doctor's prescription .... apparently for athlete's
foot, or like that.
I myself was delighted to switch to glyoxal for hardening gum size,
because, even used outdoors it was deadly with a class, & almost as
deadly indoors by myself at home in winter. So I got out of the
habit... However, there are some things it still does best and now
that the remains of my last bottle have evaporated (probably into
the lungs of this household and the neighbors), I expect to use my
influence to get some more. (Tho folks who have some should be sure
to check that it's tightly sealed, because it's apparently very
Meanwhile, what I meant to ask in this rambling message is, what
concentration formaldehyde is that?