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在中学植物教学中关于花、叶、果实颜色变化的内容均涉及花青素这一物质。为了便于演示花青素在酸性溶液中呈现红色，在碱性溶液中呈现蓝色，在中性溶液中呈现紫色的特性，我们选择了四季均能取到的花──紫鸭跖革来做变色反应实验。具体方法是：取新鲜紫鸭跖草叶45g，剪碎后放
In the teaching of middle school plants, the changes in the color of flowers, leaves and fruits all involve the anthocyanin substance. In order to facilitate the demonstration that the anthocyanin is red in the acidic solution, blue in the alkaline solution and purple in the neutral solution, we chose the flower that can be obtained in all seasons - purple tanned leather to change the color Reaction experiment. The specific method is: take fresh purple yarrow grass 45g, cut and put