Inks P.549 Chinese: ink sticks – rubbed with water on stone blocks or mortar. More complex than Indian. Liquid Indian ink: waterproof and soluble types. Both can be diluted when liquid. Insoluble: made with shellac/borax. [Windsor and Newton shellac – they also do a soluble liquid Indian ink] Coloured inks – not permanent. Writing ink – permanence not good enough for artistic use. Felt-tip markers – tips of felt or nylon. Useful for sketching and drawing. Colours mostly soluble dyes and not permanently light-proof – black the best though. Some are refillable.