U of S | Mailing List Archive | alt-photo-process-l | Re: agar sizing

Re: agar sizing





2009/3/16 Alberto Novo <alt.list@albertonovo.it>
Loris,
agar is not used for growing bacteria but to prevent them to spread, so that they grow in colonies which can be seen at naked eye. You can preserve it as usual (thymol, sodium azide, etc.). The chemical difference between agar and gelatin is that the former is a polysaccharide (like cellulose), the latter a protein.
Damiano,
yes, I know that the jelling properties of agar are stronger than gelatin. But as you want to close the pores of the paper, you need a little more substance on it.
Alberto

right!

did you note if it still has adhesive power round 40 ? 8 - )
is it yellowish or it has other "nuances"?
dam