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@nop Dipped the key in a highly concentrated solution of sodium carbonate in a sealed plastic box for food, wrapped with a strip of UV leds (5 watts), and further wrapped with a towel to keep the box slightly warm. Cook for 12 hours.

The plastic is slightly opaque, probably polypropylene or polyethylene. I don't know how to tell how well it transmits UV light at 390-400nm. I've read that common glass blocks UV more than most plastics.