How lightfast is the ink? Does it dry matt or glossy?
The drawing ink is waterbased so has a reasonable lightfastness, though it should not be put into direct sunlight.
It would depend on what surface the ink is being used on as to how glossy it would dry but on standard paper it would be matte, as it soaks into the paper. It can also be watered down and used as a wash, which is nice for wax (batik) work.