Highlighter is new in recent years made a mark with a pen with thicker, lighter ink coverage do mark key parts, cook mark after being obscured text at a glance. The most important role is to: file marked with a highlighter done, when copying, see sign ever done!
Highlighter divided into two aqueous and oily.
Oil pen is colored synthetic solvents dissolve with alcohol, some people who are sensitive to smell its flavor will produce vertigo. It is easy to write but also easy to dry, coverage is good, the price is cheaper.
Some came with a fruity highlighter.