发明授权
US6033838A Yellow dye-containing developing composition and its use in two-stage
processing of roomlight handleable black-and-white photographic elements
失效
含黄色染料的显影组合物及其在室温下可处理的黑白摄影元件的两级加工中的应用
- 专利标题： Yellow dye-containing developing composition and its use in two-stage processing of roomlight handleable black-and-white photographic elements
- 专利标题（中）： 含黄色染料的显影组合物及其在室温下可处理的黑白摄影元件的两级加工中的应用
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申请号： US260101申请日： 1999-03-02
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公开(公告)号： US6033838A公开(公告)日： 2000-03-07
- 发明人: Alan S. Fitterman , Robert E. Dickerson , Franklin C. Brayer
- 申请人： Alan S. Fitterman , Robert E. Dickerson , Franklin C. Brayer
- 申请人地址： NY Rochester
- 专利权人： Eastman Kodak Company
- 当前专利权人： Eastman Kodak Company
- 当前专利权人地址： NY Rochester
- 主分类号： G03C1/005
- IPC分类号： G03C1/005 ; G03C1/36 ; G03C1/83 ; G03C5/16 ; G03C5/26 ; G03C5/30 ; G03C5/305 ; G03C5/38
摘要：
Black-and-white elements, such as radiographic films, can be processed in roomlight because the developing composition includes a water-soluble colorant. Such colorants are water-soluble dyes that have a maximum absorption wavelength of from about 350 to about 500 nm. Processing is carried out by processing the exposed element using a two-stage process in the same processing container. In the first stage, development is initiated with an opaque developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent, a yellow colorant, and a sulfite. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to begin simultaneous development and fixing. The entire process in quite rapid, that is less than 90 seconds.
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