Calotype

Japanese: カロタイプ

Invented by Talbot in 1841, this was the first photographic method for obtaining a positive from a negative (paper negative). It is also known as the Talbot type. Paper soaked in silver nitrate solution is treated with potassium iodide to produce silver iodide on the paper, which is then made more sensitive with acidic silver gallate solution, and this is used as a photographic plate for photography. A negative is obtained by developing with acidic silver gallate solution and fixing with potassium bromide solution, and this is then printed onto photographic paper to produce a positive.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

1841年タルボットが発明したネガ（紙ネガ）からポジを得る最初の写真法。タルボタイプとも。硝酸銀溶液を含浸させた紙をヨウ化カリウムで処理して紙上にヨウ化銀を生成させ，酸性没食子硝酸銀液で感光性を高め，これを感光板として撮影。酸性没食子硝酸銀液で現像，臭化カリウム溶液で定着してネガを得，印画紙に焼き付けてポジをつくる。
→関連項目アダムソン｜写真｜ヒル

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