dir coupler meaning in English

显影抑制型成色剂

Abstract : this article reports a study on the synthesis and propertiesis of thioethers bi - equivalent magenta couplers . experiments carried on color negative film and color paper showed that these bi - equivalent couplers perform higher photographic activity and higher stability compared with conventional quadra - equivalent magenta couplers and are also different from dir couplers
文摘:本文叙述硫醚类二当量品红成色剂的合成和性能研究，经彩色胶卷和彩色相纸应用试验，与四当量成色剂比较，有着更高照相活性与稳定性，并说明了与dir品成色剂的区别。