Special-purpose markers write through moisture as easily as they write on dry surfaces, suitable for industrial, biomedical, and educational laboratories. Markers provide permanent marking on plastic disposables. When used on glass or metal reusables, or on porcelain surfaces, ink will not smear when subjected to water and can be washed off these surfaces using various solvents, allowing repeated marking. Dries quickly for immediate handling of labware. Durable tip and generous ink supply provide a long product life.