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本试验以英国纺织工业的标准(以下简称B.S)为基础,测定了若干不同类型的相片及影片的光牢度,并估计了在一般条件下彩色片明显褪色以前的可能寿命。用反转片制成的影片的乳剂感光度与褪色速度的关系为:感光度低光牢度好,中等影调的光牢度为~(B·S)4级,相当于在现代放映机中连续放映约4小时;感光度在100ASA以上的光牢度只有一级,相当于在放映机中只能放0.5小时。彩色相片的光牢度在1与2级之间,在室内一般照明下,估计可以维持4—12个月。彩色正片的光牢度,有些虽然比相片略好一点,但也很差。用银漂法制成的影片,光牢度较好,可达~(B·S)5—6级。在放映机中的使用寿命为8小时,在室内约为70个月。反转片的三层染料中,青层最不容易褪色,品红最容易,在深影调处青色能达到~(B·S)标准的最大级,而在浅影调处,品红的光牢度极差。
Based on the standards of the British textile industry (hereinafter referred to as B.S.), this test measures the light fastness of several different types of photos and films and estimates the possible life span of the color sheet before it faded significantly under normal conditions. The film made with the reversal film emulsion sensitivity and fading speed of the relationship as follows: low light fastness light sensitivity, medium tone light fastness ~ (B · S) 4, equivalent to the modern projector Continuous show about 4 hours; sensitivity above 100ASA light fastness is only one level, equivalent to the projector can only put 0.5 hours. Light fastness of color photographs is between 1 and 2 levels, with indoor general illumination estimated to last 4-12 months. Color positive film light fastness, while some slightly better than the photo, but also poor. Film made with silver bleaching method, light fastness, up to ~ (B · S) 5-6 level. In the projector life of 8 hours indoors is about 70 months. In the three layers of the reversal film, the cyan layer is the least likely to fade, and the magenta is the easiest. The cyan color can reach the maximum level of ~ (B · S) at dark shadows, while at light shadows the light fastness of magenta Extremely poor.