为使X光片图象更易鉴别,要求X光片片基带有蓝色或青紫色。用作X光胶片涤纶片基的着色染料,应具有热稳定性、耐升华、良好的混溶性以及合适的颜色,同时,对卤化银乳剂又必须是惰性的,对照相性能(感光度、反差和灰雾)也不能有不利影响。涤纶片基生产时需加热熔融和挤压,因此,要求着色剂必须能经受高达270～320℃ In order to make X-ray image easier to identify, requires X-ray film base with blue or blue. Coloring dyes used as X-ray film polyester base should have thermal stability, resistance to sublimation, good miscibility and proper color, and at the same time must be inert to silver halide emulsions. The photographic properties (sensitivity, contrast And fog) can not have adverse effects. Dacron base production is heated to melt and extrusion, therefore, requires colorants must be able to withstand up to 270 ~ 320 ℃