How is the colored gravel for aquariums made?

The type of gravel that is unnaturally coloured like blue or purple etc? What is it made of?
Ah, thanks. Yes I just broke some blue gravel open and it’s white on the inside.

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One Response to How is the colored gravel for aquariums made?

  1. nosoop4u246 says:

    It is basic gravel like you’d find anywhere else, but it is coated with epoxy of the given color.

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