If you are advanced enough for platinum then I do recommend you take one of Stephen Goldsmith's two day courses on polishing. I know I've said this before but it's true. Even professional working jewellers learned and their polishing improved. You will learn what to use and how to use it using proper professional mop and polish compounds. He's a retired master polisher who has polished the world cup and one off precious metal coins from the royal mint.
Bookmarks