I used acrylic paint mixed with water. Rub it on, rub it off. Then I have this grey stain called "sunbleached" rub it on, rub it off. Doesn't show well on the pic , but some parts faded black, some parts grey, some parts almost bare. I wanted the neck to look as old as the box. Not perfect, bit it turned out pretty well.
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What did you use for the wash on the neck. I have some old boxes to build and I don't want the necks to look like new wood.