问:用黑色华达呢、斜纹、卡其、平布等做的衣服存放久了,质地容易变脆,不耐穿,不知这是什么道理? 答:这是由于大部分黑色棉织物是用硫化青染料染成的。这种布料存放时间久了,硫化青染料中的某些“活性”硫,碰到氧会逐渐氧化,就“蜕化变质”生成硫酸,使棉纤维成为水解纤维素而发脆。 Q: The clothes made of black gabardine, twill, khaki, and plain cloth have been stored for a long time. The texture is easy to become brittle and not wearable. What is the reason? What is the reason? A: This is because most black cotton fabrics use a cyanine dye. Dyed. This kind of cloth has been stored for a long time. Some “active” sulfur in the cyanine dye will gradually oxidize when it encounters oxygen, and will generate “sulfuric acid” by “deterioration”, making the cotton fiber become hydrolyzed and brittle.