on an original rifle, maple or anything else, what would have been the finish on top? we know they used ferric nitrite but would a varnish of some type have been used over that or would it have been oil? today just about everybody uses what they call "an oil finish" like chambers hardware store tung oil etc. that are very good but in reality, they seem to just be a varnish. what would have been used in the 1700s,,,,,,,,,,,,,