Bob;
Bloom rating gives an indication of viscosity and ability to peptize (or surround) the silver halide crysta. It has nothing to do with the 'bloom' in German literature on photography related to ripening of emulsions.
We did not use it at EK as it is meaningless when doing coatings with a slide hopper, and it is also meaningless when doing ISO washes with PA gelatin. We used special gelatins for precipitation.
Usually we favored high BI gelatins of about 250 - 275.
PE |