Ocean Blue- CHARBONNEL AQUA WASH 60ML TUBES Similar to the traditional solvent-based inks and made with the same pigments these inks clean up with soapy water. They can be used for all forms of intaglio lithography and monotype. All colors are lightfast and permanent once dry. Ideal for students and artists looking for an ink that does not contain solvents and is odorless non-toxic and easy to clean.