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Type of paper

A high-grade base paper, coated with a fast light sensitive emulsion and used for photographing records, as well as designs and layouts. The base paper varies from 100% bleached chemical pulps usually paper making alpha grade, but differs from ordinary papers in purity and chemical treatment, being made with special precautions to exclude metallic residues. It is specially treated with wetstrength agents to offer resistance to acid, alkaline, and other chemical solutions used in the photographic process. Attention is also paid to the inertness of the paper towards photographies sensitizing mixtures. Uniformity of surface and colour are also important. The paper base is finished with a gelatin sizing to prevent the photographic emulsion coating from penetrating too deeply into the sheet.

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