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一、对胶片密度变化的实验和测量。 选用两种机型、两种胶片,在高温高湿的条件下进行拍摄。环境为:相对湿度93～100％,温度为34～37C。缩微胶片在机内停留3.5小时后,胶片发粘、密度降低。 二、高温高湿对胶片密度影响浅析。 1.已曝光部分。 拍摄过（感光）的缩微片,在高温高湿环境中经过一段时间后,感光度下降,这与潜影衰退有关。其衰退速度受温度、湿度等影响,温度愈高、湿度愈大,衰退愈快。 2.未曝光部分。
First, the film density changes in the experiment and measurement. Choose two models, two films, shooting under high temperature and humidity conditions. The environment is: relative humidity 93 ~ 100%, the temperature is 34 ~ 37C. After the microfilm stayed in the machine for 3.5 hours, the film was tacky and the density was reduced. Second, the impact of high temperature and humidity on the film density. Exposed part Filmed (photographic) microfilm, in high temperature and humidity environment after a period of time, the sensitivity decreased, which is related to the latent image recession. The decline rate of temperature, humidity and other effects, the higher the temperature, the greater the humidity, the faster the recession. 2. unexposed part.