Bleaching Rocks

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TxBrew

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I just got a new fish tank and have several nice pieces of limestone, around here called Texas holey rock. It looks like this;



I've soaked the rocks overnight in pure bleach but can't seem to get them the really white color I would like.

Any of suggestions on how to bleach these rocks so they are bright white.
 

SuperiorBrew

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I think I remember reading hydrogen peroxide works on some
 
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