The symbol used for sulphur is the cross with the triangle. I was wondering if maybe it was part of the gas that was released at the cracks, too. Then again, here's a little glitch: phosphorus and sulphur have very similar alchemical symbols. Phosphorus has the triangle on the bottom and the cross coming out of the top. Sulphur is reversed with a triangle on top an cross on the bottom. If we go with Ink's tattoos as shown it's sulphur but in the episode they didn't specify where the triangle was.
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