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the brackets themselves are either clear (ceramic) or metal. it's the tiny elastics ('ties')that attach the wire to the brackets that can be coloured.
I always had the clear ones. They would discolour from coffee or anything with an artifiicial chicken base. Rice a roni would turn them neon yellow, but the brackets themselves remained clear.
Simply go in to have the discoloured ties changed frequently; it's a 30 second job.
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