22k and 24k are usually about the same for me, I think? It does depend on your source. River gold, refined gold and other types have different metal impurities. Many people prefer 22k over 24k since it can 'stick' a bit easier while and after application. You can most likely buy any amount at a local coin shop or gold & silver dealer.
Yes, I wear a respirator when working with fuming or high metal powders/frits if possible. It's pretty inconvenient if you're blowing, though - using a blowhose helps a bit there.
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