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How to you go about creating an effect that looks like this?
I just cant imagine a way of doing it.

Devlan Mud wash. Seriously. Varying amounts of it will do wonders.

My mate has that wash, so I'll give that a go and have a go.
Thanks

EDIT
what about the blue rust on copper piping

That rust is done by painting the area with Tin Bitz then probably some Dwarf Bronze, then a Thrakka Green wash or two in the recesses.

Do you mean the green stuff that forms around the edges? Can't remember the name of that but then generally say to use a mix of turquise and dark green watered down then washed into the recesses.

If you're asking about the blue 'grime' stuff in the second pic (which I think you are) then you may want to try mixing ultramarines blue and dark angels green 1:1 then water it down again 1:1 or 1:2. That's the easiest way I've found to make verdigri which looks virtually identical to that.

well copper oxide (copper's rust) is blue / green....

Ah ok thanks guys, I ment just grime in general, like rusted metals and work ork wargear etc..

Washes, stippled paint, oil filters, weathering powders/pigments... plenty of different ways to achieve rust, mud, stains, and general grime. There are plenty of tutorials floating around online for each one of these methods, and others. Give a quick search for the specific gunk you want (remember some less than common jargon that may help - that blue-green stuff on copper is called "verdigris" and if it's not quite rust, it's probably "patina").

Cheers for that mate. =]
Thanks