Quote:
Originally Posted by Gym Whourlfeld
you could drag a green crayola across the mortar to make a little fungus-look.
I watched a Tv movie prop painter age some brand new concrete with chaulk, mostly yellows and greys, when he got done it looked like it had been there for a very long time. It was the base to a statue that was also supposed to be very old.
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I've found the most realistic mold-on-stone look is from blotting paint (green, yellow, whatever) at the top of your structure. Take a spray bottle and go heavy with the water. The water finds it's natural pathway down to the bottom. I then touch up areas with more dabs of paint - especially cracks or where the original water path pools.
That works for me because I sometimes have a tendency to overdo 'natural' looks to the point where they look unnatural. So, letting your mediums 'do their own thing' can be quite rewarding.