The Baryta layer _is_ a coating of gelatin. It is the sizing for the
paper. Most papers have more than one layer but the number of layers
also has to do with what sort of texture the paper is to have. Note that
there is a difference between texture and surface: texture is gotten by
callendering the paper before the emulsion is coated and texture is
usually from something in the overcoating (like talc).
Generally fiber paper has three basic coatings: the baryta layer, the
emulsion coated over this, and a protective layer of gelatin coated over
the emulsion. This protective layer is what is used to obtain the very
smooth surface when ferrotyping.
Dave Valvo, who is on this list, is a former Kodak paper expert and
can unboubtedly provide more complete information.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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