In anticipation of my O scale Trackside Trio arriving (woohoo) I have been trying some wood staining. These are craft sticks that measure out to about a 4x12. Each board was scribed with a pick and wire brushed. Not much else other than trying a couple of nail and knot holes and a few nicks here and there. I was just trying to get my coloring down.
The first pic is straight black IA followed by drybrushing in tan, gray, then linen.
2nd pic is a few boards with varying formulas of black/brown IA.
3rd pic is of the same boards lightly sanded to highlight.
I have also ordered all of the chalks suggested by Brett to give those a try as well. I would be interested to see what others think the advantages are of IA or chalks or both.