(Unfortunately, I have chosen to remove this content due to unchecked behavior by others on this board. Moderators may humor it because it comes from their "friend", but I will not. My apologies to those who will not benefit from it in the future.)
(Unfortunately, I have chosen to remove this content due to unchecked behaviors by others on this board. My apologies to those who will not benefit from it in the future.)
Back your camera/phone away from the marble. It can't focus that close. Manual focus before taking the photo. Otherwise it will probably focus on the background.
Aim for in-focus, not big.
"Half and half" seemed to suggest an accepted marble name. Which (to me) suggested the long-established huge Akro Orange and Blue patch by the same name. Granted, that name goes back ~24 or so years before it was corrupted by an inexperienced Akro-naming person.
Keep in mind that some glass colors (like white) REFLECT UV energy. That reflection (or perceived color shift) doesn't mean that the glass is UV reactive.