I have one stock in particular that's been completely refinished, but one place where a large gouge was, my smith used some kind of filler material - anyway, this filler didn't take the stain, and it's a much lighter color - about 1.5 centimeters across. Is there any kind of pen/stain/substance I can use to put a more brownish color on this that would blend well? Also, what about ordinary nicks/cuts/scratches - a good coloration fix for that? Thanks.