potash alum

基本解釋

In potash it turns black, but in alum nothing happens until you bring it to the boil, then purple colour comes flooding out.
在碳酸鉀中，它變成黑色，而在明礬中一開始卻什么反應都沒有，直到煮沸后紫色都溢出來了。
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.
利用四川某含鉀巖石制得的鉀明礬進一步制備硫酸型鉀氮肥和氫氧化鋁，從原理、工藝等方面進行探討，并通過中試解決了工業(yè)化生產(chǎn)所出現(xiàn)的問題。
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.
前幾天我已經(jīng)將一些茜草浸泡在明礬里，當我們加入碳酸鉀時，得到了一種可愛的粉紅色。