potash alum

基本解释

In potash it turns black, but in alum nothing happens until you bring it to the boil, then purple colour comes flooding out.
在碳酸钾中，它变成黑色，而在明矾中一开始却什么反应都没有，直到煮沸后紫色都溢出来了。
The principle and process of producing potassium-nitrogen compound fertilizer and aluminium hydroxide from potash alum are studied. Some problems are solved through the pilot test.
利用四川某含钾岩石制得的钾明矾进一步制备硫酸型钾氮肥和氢氧化铝，从原理、工艺等方面进行探讨，并通过中试解决了工业化生产所出现的问题。
I had left some Qian Cao to soak with some alum a couple of days before and when we added potash we got a lovely pink.
前几天我已经将一些茜草浸泡在明矾里，当我们加入碳酸钾时，得到了一种可爱的粉红色。