Charbonnel Aqua Wash Etching Inks are water-washable , with an oil emulsion that allows work similar to traditional solvent-based inks. Made from extra-fine quality pigments, these etching inks are very lightfast and permanent when dry, and excellent for all techniques, including intaglio, relief, etching, and woodcut on linoleum, monotype, aquatint, and more. Formulated especially for artists and students working in groups, Charbonnel Aqua Wash Inks clean up without solvents, and are non-toxic , odorless, and easy to wipe. Instruments, tools, and plates do not get rusty when using Aqua Wash Inks because the inks do not contain water. They dry slowly, at the same rate as solvent-based inks.