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在一支试管中加入豌豆大小的一团可溶性淀粉,滴入四、五滴水,振荡成糊状,再逐滴滴入浓硫酸,边滴边振荡,到糊状物变成透明米黄色稠粘状液体止,再振荡片刻即可。
Add a pea-size soluble starch to a test tube and drip in four or five drops of water. Shake into a paste. Add dropwise concentrated sulfuric acid. Vibrate while dripping to make the paste transparent and beige. The liquid stops and can oscillate for a while.