This one is a Pelt Rainbo--not a "Muddie".
Muddies no not react to UV light.
Muddies have a green-ish opaque swirl to them.
The base glass of a "Muddie" is opal and though they appear to be opaque—they are not.
I love me a good "Muddie"--just love them!! I get-em whem I can--I just love them.
Has anyone ever heard of a Moldy??(Spelling may-be incorrect) I just like the name--European I believe.
Marble—On!!