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I came across this review on Amazon. The cold drink was placed on top of the agate stone and the dye bled and left a permanent mark on the table.

Why does this happen? Is it because of the condensation as mentioned by the customer? Can regular warm water also cause the same effect?

I just want to know why dyes work, and what makes them bleed.

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Dyeing agate is a common practice- the stone is real, but it's been cosmetically altered. The stone gets soaked in a chemical solution, which is absorbed into the microscopic pores in the stone. Whatever dye the person who made these coasters used must have been water-soluble. So, yes, cold water would also cause the pigments to bleed.

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