I had a cabinet shop plane a 5/4 x 7 white oak board i had left over from lineing my horse stalls, many years ago.When I picked it up the owner asked if I knew it had powder post beattles in it,which I didn't.There wasn't any evidence of dust where it had set overnight.I cut out the six pieces I wanted to modify my MLB widgeon and placed them in a plastic bag and sprinkled powder, used to kill fire ants.I will leave it for a week or so to see what happens.Any thoughts?