I don't think I'm terribly consistent in my adjustments for getting a reduction flame. I usually turn the propane up, and get pretty long yellow candles. For me the trick with the amber luster is that it likes just a quick flash through the reducing flame. It's easy to over-reduce, but you can get rid of the ugly stuff by going back to a neutral flame and then trying again.
I haven't played as much with the peacock luster.
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