【摘要】 本文分析了黑白摄影中化学药品的性能,阐述了pH、温度、浓度、搅动方法对这些药品功效的影响,研究了药品失效的原因及保护措施,并根据自己的实践,提出了修改配方的化学方法,以及改进影调的物理措施。更多还原

【Abstract】 nthis paper the properties of chemicals used in the black-white photography are described,theeffects of pH,temperature,concentration,andstirring ways onthe efficacy of the chemicals are expounded.andthecauses ofinvalidation of the chemicals andits preventing measures were explored.Moreover,this paper gives chem-ical methods to change chemical formulation,and physical measures toi mprove the color tone of the pictures.更多还原