Re: chrome alum

[pete <temperaprint@blueyonder.co.uk>]

Christine,

TemperaPrint will print on any surface
with the minimum of preparation it will
go directly onto glass, however a
 prior coat of acrylic is advisable.
The problem with this egg colloid
 is that it can be far too adhesive. Paper
 can pose problems but can be surmounted
by sizing with a strong coat of gelatine say 8% to 12 %.

Pete








> Sandy King (or anyone else in the know), a while back you said you
> usually use chrome alum for hardener, sometimes potassium alum, too.  You
> mentioned mixing 2 g of chrome alum (the purple stuff)  per 1000 ml of
> gelatin solution.  This is about 1/2 tsp.  How much *gelatin* do you use in
> your 1000 ml--my formula calls for 2 tsp Knox gelatin, does yours, too?
> I'm starting to work with tiles and glass to get liquid emulsion to
> stick, and a student wants to try to sub glass with the chrome alum solution
> for gum; she tried it already with varnish and a mild sanding and the gum
> totally came off.  She was inspired by my telling her a while back about
> Sarah Van Keuren's students doing gum on glass. Short of a sandblaster,
> we're going to keep trying.
> Chris
>