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金相摄影一般常采用D-27显影液进行底片和相纸显影。由于该显影液配方中药品配合恰当,只要曝光和显影正确,反差、层次、密度以及银粒都能满使足金相摄影的要求,这是它被广泛采用的主要原因。用D-72显影液的缺点是溶液易氧化,保存期短,在南方夏季气温高时更是如此,不能大量配制溶液。特别是显影液使用过一次以后,如不及时继续使用,虽然看来药力尚未衰竭,但由于氧化原因在短时间内就会变色失效造成浪费。我们希望放置时间较长,能大量配制溶液,这样有利于及时配合生产和科研,避免显影液的浪费,提高其利用率。另外,我们从D-72显影液配方中可知它是以米吐尔为主要显影剂,米吐尔对皮肤过敏的人有刺激性。为了解决以上问题而又
Metallographic photography is generally used D-27 developer film and photographic development. Due to the proper combination of drugs in the developer solution, it is the main reason that it is widely used as long as the correct exposure and development, contrast, gradation, density and silver particles can meet the requirements of full metallography. The disadvantage of using D-72 developer is that the solution is easily oxidized and the shelf life is short, especially at high summer temperatures in the South, which can not be formulated in bulk. In particular, the developer used once, if not continue to use, although it seems that the power has not yet failed, but due to oxidation causes a waste of color in a short time will be invalid. We hope to place a longer time, can be a large number of preparation solution, which is conducive to timely production and scientific research, to avoid the waste of developer, improve its utilization. In addition, we know from the formula of D-72 developer that it is based on Motell as the main developer, Motell irritant to the skin irritation. In order to solve the above problems