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Superadditive developer : ウィキペディア英語版 | Superadditive developer Photographic developer solutions may contain more than one developing agents, such as Metol and hydroquinone, or Phenidone and hydroquinone. This is because they work together to a synergistic effect, called superadditive development. ==Definition==
Superadditive development commonly means that the mathematical superadditive inequality holds for the rate of development. That is, the rate of development of the two (or more) agents together is greater than the sum of the rate of each agent used alone. There are cases that ''density'' superadditivity holds without ''rate'' superadditivity. Note that the term superadditive development is usually ''not'' used to mean density superadditivity: the image density obtained from the combined agents is greater than the sum of the density from each agent used alone.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Superadditive developer」の詳細全文を読む
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