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I have a spatula with a wooden handle that split when it was left soaking for maybe five hours. That was completely untreated, though.A silicone utensil is ideal for candy making, in my experience. Most silicone things are safe to at least 400, and since they're rubbery, that candy crust just flakes off. I do little batches of caramel with my silicone spatula, and I don't even have to soak it.