現在我們使用着許許多多种人工合成的染料——合成染料。当然,合成染料的主要用途是給各种纖維(棉、毛、絲、蔴和人造纖維)和織物染色和印花。但是由于染料的着色本領、吸收特性和其他的附屬性質,也使它們可以用來适应特殊的需要。其中許多用途,还往往是我們意想不到的呢!这里給讀者介紹一些关于染料除普通印染之外的新用途。在織品上閃閃發光有一种酸性熒光黃,能够發出强烈的綠色熒光。即使溶液中熒光黄濃度只有四千万分之一,肉眼也还可以把熒光辨認出来。甚至从二亿分之一濃度的溶液点滴,也可以用仪器檢查出熒光黄的存在。因此,在水利工作 Now we use many kinds of synthetic dyes - synthetic dyes. Of course, the main use of synthetic dyes is to dye and print a variety of fibers (cotton, wool, silk, hemp, and man-made fibers) and fabrics. However, due to the dyeing power, absorption characteristics and other accessory properties of dyes, they can also be used to meet special needs. Many of these uses are often unexpected. The reader is introduced here to some new uses of dyes other than ordinary printing and dyeing. Sparkling on the fabric is an acid fluorescent yellow that emits intense green fluorescence. Even if the concentration of fluorescent yellow in the solution is only 40 millionths, the naked eye can recognize the fluorescence. Even with a one-hundred-millionth concentration of solution, the presence of fluorescent yellow can be detected with the instrument. Therefore, working in water conservancy