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1.显影液与定影液的鉴别①胶卷片头试验法找一段已曝光的胶卷,剪取一小段用水浸润后,置入待鉴别液,数分钟后观看胶卷的变化。如置入溶液后胶卷变黑,则鉴别液为显影液;如置入溶液后胶卷变透明,则鉴别液为定影液。一般暗室都备有D-76、D-72显影液,如果分辨不清这两种黑白显影液,可用片头试验法将其区别;即胶卷快速变黑者为D-72显影液,胶卷迟缓变黑者为D-76显影液。②相纸试验法找一已曝光的相纸小条,插入鉴别液中,能使相纸乳剂面变黑的溶液为显影液,不能使相纸乳剂面变黑的溶液为定影液。用前述的鉴别方法可同样将D-76显影液和D-72显影液加以区分。③试纸检验法撕取pH试纸一张插入鉴别液约一秒钟,然后取
1. Identification of developer and fixing solution ① Film leader test method to find an exposed film, cut a short period of infiltration of water, into the identification of liquid, a few minutes after watching the film changes. If the film into the solution after the black, the identification of liquid as the developer; such as the film into the solution becomes transparent, the identification of liquid as the fixing solution. General darkroom is equipped with D-76, D-72 developer, if you can not distinguish between the two black and white developer, the first test can be used to make the difference; the film quickly black to D-72 developers, slow film delay Black for the D-76 developer. ② photographic paper test method to find a photographic paper strip has been exposed, insert the identification solution, the photographic emulsion surface can turn black solution for the developer, can not make the photographic emulsion surface black solution as the fixing solution. D-76 Developer and D-72 Developer can be similarly distinguished using the same method described above. ③ dipstick test method to take a pH test paper into the identification solution for about one second, and then take