将白纸在蜡烛上烤一烤,居然就出现了一封秘密书信。游戏道具:(1)蜡烛(2)毛笔(3)画纸(4)柠檬汁游戏步骤:见右图图解原理:这就是所谓的“烤墨纸”。用柠檬汁写的字画用火烤会变色,是因为柠檬汁中含有的枸橼酸与纸纤维中纤维素成分的羟基反应而失去水分。游戏小贴士:将纸放在水中 The white paper was baked on the candle and a secret letter appeared. Game props: (1) candle (2) brush (3) drawing paper (4) lemon juice game steps: see the right figure principle: This is the so-called “baking ink paper.” The words written in lemon juice are roasted with heat and change color because the citric acid contained in the lemon juice reacts with the hydroxyl group of the cellulose component in the paper fiber to lose moisture. Game Tips: Put paper in water