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在市场上有多种隐形墨水。最原始的隐形墨水是用淀粉溶液写在纸上,用碘酒来显字。下面介绍一种新型的隐形墨水,供化学课外活动使用,以提高学生的学习兴趣。
There are a variety of invisible inks on the market. The most primitive invisible ink is written on paper with a starch solution and the word is displayed with iodine. The following describes a new type of invisible ink for use in chemistry extracurricular activities to enhance students’ interest in learning.