Paboook, do you mean the large tin or the 18ml dropper bottle of ink?
Looking on the Armypainter website, the large tin seems to be turps based?
Presumably using the 18ml ink lets you simply wash the brush in water?
Edit: Ordered a couple of the 18ml ink bottles online, fingers crossed it works OK

. If my figures end up looking half as good as Paboook's I'll be a very happy bunny!