Re: Combining gelatins
s carl king (sanking@hubcap.clemson.edu)
Tue, 30 Apr 1996 10:17:57 -0400 (EDT)
>
>
> Is it possible to mix two gelatins with different strengths to achieve
> a Bloom that differs from that of the original constituents?
>
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> -greg schmitz
>
>
A mixture of equal parts of 100 bloom and 300 bloom gelatin acts like
a 150 bloom gelatin in the very important quality of how much water it
will absorb. As most people know, a 100 bloom gelatin will absorb much
less water than one of 300 bloom (this is why formulas for making carbon
tissue show such varying percentages for the gelatin solution, or at
least one of the major reasons). A mix of the two will absorb more water
than the 100 bloom by itself, less than the 300 bloom by itself. This is
perhaps not a real definition of bloom, but it does offer a practical
explanation for what happens in actual use (at least as most of us
use gelatins, to size papers, make carbon tissue, prepare emulsions, etc.).
Sandy King
Sanking@hubcap.clemson.edu