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| before |
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| during, showing D2 bloom |
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| after |
You'll sometimes hear a volunteer or professional refer to D2 bloom. That's when the D2 moves impurities in the stone to the surface making it look more discolored than it was before. With some gentle agitation and lots of water, the bloom comes off, along with the rest of the impurities. When a stone has deep lichen (those dark spots) like this one, you can expect a lot of impurities in the stone that you can't see on the surface.
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