深蓝青由粉末状天青石制成的蓝色颜料。
性能简介：纯蓝色粉末，色泽鲜艳，着色力强，耐热性耐碱性好。
Properties: pure blue powder, bright color and good dyeing force, good heat resistance good alkali resistance.
将无水硫酸钢(白色粉末)放进装有空压机油的试管中，如硫酸铜由白色变为蓝色，这也能证明油中有水分存在。
Will have no water steel (sulfuric acid) with white powder into the air pressure of the oil tube, such as copper sulphate from white to blue, it can also prove oil there is water there.
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