Re: alum as paper size

eml@gate.net
Fri, 28 Jul 1995 08:43:21 -0400 (EDT)

It was only my intent to suggest that making a material
like gelatin too hard might lead to embrittlement with
age. After all, paper is both flexible and has a considerable
tendency to expand and contract with humidity changes.

Of course, in some processes like Carbro andGum-bichromate, the
very process is dependent uponthe tanning of the medium and
washing away of the untanned material. It's obvious that
gelatine, etc MUST be tanned to get a result. Regarding
mold and fungus,I was unawre that alum deterred or prevented
these. I had always thought that correcy procedure was to
include a very small amount of phenol or thymol to prevent these.

Thanks for the information!

Ed

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