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Srebrowe techniki fotograficzne

100%

Gołąb M.

Ochrona Zabytków

1982

issue 1-2

45-52

In the second half of the 19th century silver photographs were made on various materials. Paper, textile and glass were most freguently used for th a t purpose. Occasionally, other less typical materials such as wood or metal were used. Photographs on these bases are found rathe r in works of amateurs th an in mass production, where paper was a dominating material. Photography of th a t time could exist on its own as a work of a rt or a produce of craftsmanship. On rare occasions it served as a base for paintings or wood-engravings. Some techniques, e.g. ambrotypography, ferrotypography, went with specific bases, while others could be excuted on various materials. In the majority of technique a silver picture was formed on a photographic emulsion or on the surface p re paring the base. In other techniques, e.g. on painting canvass, emulsion was not used; instead, the base was coated w ith a solution of photosensitive salt. Photographic emulsions and solutions for the prepa ra tion of the base were made on th e basis of proteins, colloidon, adhesive, agar-agar. Silver chloride, iodide, bromide and n itra te were employed. A silver picture was toned down in solutions of metal and nonmetal salts. This was necessary in the case of the so-called daylight papers, i.e. albumin, ” Aristo”, celloidine and salted paper. Pictures on these papers did not require chemical developing but due to an u n sa tisfactory colour they had to be toned down. The toning b ath was sometimes combined with fixation. Protos made in big qunatities in photographic shops were as a rule retouched by stippling, taching of spot covering techniques. A ready photo was varnished and put on cardboard.

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1 Ochrona Zabytków

1 1982

1 Gołąb M.

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Srebrowe techniki fotograficzne