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The ambrotype, also known as a collodion positive in the UK, is a positive photograph on glass made by a variant of the wet plate collodion process. Following the invention of daguerreotypes, cheaper than the French invention, ambrotypes came to replace them. Like a print on paper, it is viewed by reflected light.
AGFA photographic plates, 1880 Mimosa Panchroma-Studio-Antihalo Panchromatic glass plates, 9 x 12cm, Mimosa A.-G. Dresden Negative plate. Photographic plates preceded photographic film as a capture medium in photography. The light-sensitive emulsion of silver salts was coated on a glass plate, typically thinner than common window glass. They ...
Collodion printing was typically done on albumen paper. As collodion is a sticky and transparent medium and can be soaked in a solution of silver nitrate while wet, it is ideal for coating stable surfaces such as glass or metal for photography. When a metal plate is coated with collodion, charged with silver nitrate, exposed, and developed, it ...
Exposure of the photo resist through a negative and its subsequent development creates areas on the plate that are either protected by the resist or exposed to the effects of the dye, bleach, or etchant that are used to create the contrasting mark. [9] Type 2 photosensitive anodized aluminum must be sealed just like Type 1.
A tintype, also known as a melanotype or ferrotype, is a photograph made by creating a direct positive on a thin sheet of metal, colloquially called 'tin' (though not actually tin-coated), coated with a dark lacquer or enamel and used as the support for the photographic emulsion. It was introduced in 1853 by Adolphe Alexandre Martin in Paris. [1]
The collection comprises 35,427 glass plates, ranging in size from 4 to 12 inches (100 to 300 mm), as well as almost 50,000 prints, and forms a detailed photographic record of Thailand (then known as Siam) during the country's period of modernization. [1] The collection was inscribed on the UNESCO Memory of the World Register in 2017. [2]
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