Ive used it on wood a few times... Just so you know... It fades to a light purple..ish/ pink quickly on white woods, lol... Never tried it on leather tho... Mulberries or beet juice are my go to's now... Fyi... My grandpappy(and several other locals of his generation) swear by polkberries for rheumatism. He froze them and swallowed one every day for many years, lol... Brian