彩色印刷就是套色的胶版刷印。它除了具有“锌版平版印刷法”的全部优点外,还有下面两个优点:(一)因为它是彩色印刷,所以印出来的图线特别清晰、美观;(二)采用这种印刷方法,就可以把各种管道综合在一张图上,从而既避免了管道打架,也便利了施工。彩色印刷的操作程序如下:1.将锌版上的桃胶洗掉,用汽油擦去黑线,用湿毛巾揩净。2.滚彩色油墨。要边滚边用湿毛巾擦,直到上足 Color printing is the color offset printing. In addition to all the advantages of the “lithographic lithography”, it has the following two advantages: (a) because it is a color printing, the printed lines are particularly clear and beautiful; (b) using this printing method , You can put all kinds of pipes integrated in a map, thus not only to avoid pipe fighting, but also facilitate the construction. Color printing operating procedures are as follows: 1. The peach gum on the zinc version washed off the black line with gasoline, with a wet towel 揩 net. 2 roll color ink. Wipe it with a wet towel until it is full