Two pieces of originally similar Montana petrified wood, the piece on the left having been bleached. Source: https://forum.rocktumblinghobby.com/thread/85292/bleaching-petrified-wood
rthf before after
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A Blog About Stone Gathering, Tumbling and Polishing, and Rocks and Landscapes, from New Zealand – With Musical Interludes (john.tumblestone@gmail.com)