I don't know about neoprene, but they make wetsuits out of that. You would think that a diver, wearing a suit, would not be exposing his skin, to a carcinogen nor a poison. The suit makers would not be in business long.
Oven mitts: would you wear a mitt and pull an apple pie out of the oven, accidentally touch the pie, and then eat it if it had a poison? The tank is sealed with 100% silicone, and if the mitts say the same, they would be good in the tank.
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