Tanked Posted March 9, 2023 Share Posted March 9, 2023 Like many of us on these forums I spend a lot of time staring at the ground looking for that next piece of hardscape. The habit started long before my first aquarium. Rocks are inexpensive souvenirs. A childhood trip to the natural history museum got me interested in glowing rocks, and UV light in general. I have several "black lights". They are useful for finding car keys lost in the yard as well as all of the suggested uses. I'm looking for a battery operated light in the 365nm. range, $10- $50. Do you uses one? Is it reliable? After watching a few videos on cleaning crystals, geodes, and the like, I decided to "clean" some of my geodes hoping to find something better underneath. I used muriatic acid to clean a few test pieces, and a baking soda solution to neutralize the acid The results were disappointing, but I wasn't expecting much. One geode fragment did come out as a bright white. This is where the problem started. Over the next few days the test rocks began to turn yellow. Can this be reversed? I don't have any really great specimens, so I don't want to ruin the few good ones that I have. Link to comment Share on other sites More sharing options...
Fish Folk Posted March 10, 2023 Share Posted March 10, 2023 If you have an interest in the chemistry of yellowing following acid, you can pull on this thread... https://www.mindat.org/mesg-464360.html 1 Link to comment Share on other sites More sharing options...
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