You won't have to remove them if you just want to confirm that they're ivory. They're clearly ivory in my opinion and the best evidence is already accessible. You don't need to test them with a hot pin.
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If those aren't ivory, I want to buy stock in the company that made them.
The "hot pin" method is often suggested. I just don't buy it. My thought is that if I can't tell the difference, that means they are ivory.