Reduction sensitization

Japanese: 還元増感 - かんげんぞうかん

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[Chemical sensitization]
When a sensitizer is added to a photographic emulsion and it is ripened, the silver halide crystals in the emulsion react chemically with the sensitizer to create sensitization nuclei in the crystals. Depending on the sensitizer used, there are sulfur sensitization, reduction sensitization, and gold sensitization. Sulfur sensitization is a sensitization method in which trace amounts of sodium thiosulfate and organic sulfur compounds are added to the emulsion, and it is thought that silver sulfide is formed in the silver halide crystals, improving the efficiency of the exposure process.

*Some of the terminology that refers to "reduction sensitization" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

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［化学増感chemical sensitization］
　写真乳剤に増感剤を加えて熟成すると，乳剤中のハロゲン化銀結晶は増感剤と化学反応を起こして結晶中に増感核を作る。用いる増感剤によって硫黄増感，還元増感および金増感がある。硫黄増感は乳剤に微量のチオ硫酸ナトリウム，有機硫黄化合物を加える増感法で，ハロゲン化銀結晶に硫化銀が生成して感光過程の効率をよくすると考えられる。…

※「還元増感」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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