Do you know highlighter?
Highlighter is a marker pen produced in recent years. It uses thicker and lighter ink to cover key parts for marking. After marking, it does not block the text at a glance. The highlighter has a fluorescent agent. When it encounters ultraviolet rays (sunlight, fluorescent lamps, and mercury lamps are more), it will produce a fluorescent effect and emit white light, which makes the color look dazzling and fluorescent. It is often used in office and study.
Water-based highlighters are newly created in recent years. They are used for marking. Thicker and lighter ink is used to cover key parts for marking. After marking, the blocked text is clear at a glance.
The most important roles are:
Documents that have been marked with a highlighter will not be visible when they are copied!