If it glows orange or green in blacklight??

[Ekim929]

First of all its neat as ever ... But does it mean that they are old and what is the difference between the orange and the green ?

[Steph]

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. 

[Steph]

There are other colors of glow also ... such as blue ... which I think comes from calcium. 

[Ekim929]

Ok cool all I got so far are orange an green and it is in most of my marbles that I've checked so far 

[Ekim929]

[Ekim929]

[Steph]