广播电视英语短句 第 115 课：染上色彩-4

But chemical mordants such as alum are popular today. 但像明矾这样的化学媒染剂现今使用的更广泛。

Alum is sold in many stores. 许多商店都有销售明矾。

It is often mixed with cream of tartar, a fine powder commonly used in cooking. 它经常与酒石混合使用，酒石是用于烹饪上的一种粉末状调料。

Mix eight grams of alum with seven grams of cream of tartar in a small amount of hot water. 将8克明矾和7克酒石混合在一起，放入少量的热水中。

Add the solution to a metal pan of cool water. 再将溶液加入盛有凉水的金属锅中。