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Have you ever forgotten to bring a paper and had to tip on your hand? Have you ever seen a dirty white board without cleaning? Have you ever tried to present others an analysis chart but found nowhere to draw on? The invisible ink is made of biodegradable protein like squid ink. It can make the word disappear after writing. The existing time of the word can be controlled by adjusting catalyst. The time can set as 30 min, 60min or 120min.