Yes it's only on the surface I believe, I first thought Peltier slag. Cut line was noticed I don't believe it's an Akro Slag I could be wrong it seems brushed on what led me to believe either CAC or MFC.
Does reflecting UV light mean once the light goes out they still glow just asking not sure sure what this means I've heard the term reactive too first time for reflecting, thank you in advance Alan.
Master Marble🧡💚🖤🇺🇲
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