Colouring brass

[Qball]

I found a recipy on colouring brass and was interested to know if any one ever tryed this?
If so, how does the colour hold up?
Been looking for cemicals here but only found them in sacks of 200kilos so far
aint gone do that much brass

http://www.gunandgame.com/forums/handloading/24363-colouring-brass.html