Double-ended Erasable Highlighter

In today's stationery stores, there are usually all kinds of highlighters, domestic and imported, with different prices. There will be a special rubber-like eraser on the end of the pen barrel or on the cap head. After that, use this eraser to rub on the words, and the writing disappears, and there is no trace, so what is the principle of the erasable highlighter?

The general highlighter has a fluorescent agent, which produces a fluorescent effect when it encounters ultraviolet rays, emitting white light, which makes the color look dazzling and fluorescent. There's a little secret in the ink in erasable highlighters.

The magic secret is actually in the ink. The ink of this pen contains a chromogenic material, a chromogenic agent, and a discoloration temperature adjuster. At room temperature, the chromogenic material and the chromogenic agent combine to generate color, but when the temperature is high enough When the temperature is above 60℃, the discoloration temperature adjuster will prevent the combination of the color-generating material and the color-developing agent, so that the color disappears. When the temperature drops to an extremely low level, generally below -18℃, the handwriting will be reproduced. , The rubber tip at the end of the pen is used to rub against the paper surface, and then generate heat, making the ink writing transparent, and it looks like it has disappeared. In chemical terms, this is called thermal reaction.

The principle of the erasable pen is mainly heat-sensitive reaction. The ink of this pen contains chromogenic material, chromogenic agent, and discoloration temperature adjuster. At room temperature, the combination of chromogenic material and chromogenic agent generates color. When students write typos Just wipe it off.