Special-purpose markers are designed to write through moisture as easily as they write on dry surfaces. The marker provides permanent marking on plastic disposables. On glass or metal reusables, or on porcelain surfaces, the ink will not smear when subjected to water or alcohol during normal use. It can be washed off these surfaces using various solvents, allowing them to be repeatedly marked. Ink dries instantly for immediate handling of labware. Black, Green or Red Ink.