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<p>[QUOTE=&quot;2manybooks, post: 575388, member: 8267&quot;]Gelatin emulsions (the layer that carries the silver halides) have been used since the 1880&#039;s on both negatives (glass, and later various polymer films) and paper prints, as moreotherstuff has said. Gelatin remains somewhat sensitive to water, unlike the earlier collodion and albumen emulsions. Under magnification, gelatin may be seen to swell slightly if a drop of water is placed on it.[/QUOTE]</p><p><br /></p>

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