My Buddy "leech"  was left with some coldcandy and was over when I had the black light on in the room all the crystals were diferent we went thru and picked out 3 diferent fades
1/ almost neon yelowish green
2/ not as steady of glow yellow green
3/ clear and didnt have any glow at all

My question is is all of this pure or mixed with tool trash?
My guess is msnplus or possibly mixed bag etc. they also burn diferent ... anyone know how to tell? I havnt been around this enouph to help him and he is color blind .

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what to use to locate the right crystals & Color

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I would suggest a new SOURCE.

clean it up with some acetone (at least) and maybe do a rxtal and see how much gets washed away.

Post 514622

(geezmeister: "uv light", Stimulants)

Thats absolutly brilliant!
Aquarium shops should have UV lights.

Don't try to use one of them handheld battery operated blacklight/flashlights that you find at the world of wall around Halloween. They suck! Swim tried this light on a variety of mixtures and it will not help to distinguish a difference in anything.

Swim should have tried it out in the store before purchasing. At least it now helps him to find his scorpion when he is hiding.