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If it glows orange or green in blacklight??


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Bright green-ish is probably from uranium.

Orange could be from manganese.  

Uranium was used in the 1800's and 1900's ... and then I think there was a time in the mid 1900's when it wasn't available, maybe because of war, and then it was used again in the late 1900's.  And I guess it's been used this century, but I don't know. 


So, no, it usually isn't a clue about the age.  Except I think for sulphides (the clear glass marbles with the little white figures in them) ... I think that a faint glow could mean old for those ... and if the faint glow is missing that might mean new.  Maybe someone with more sulphide experience can confirm. 

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