Can anyone tell me why some of my coloured agate slices have faded
and others have not?
I had a small selection of coloured agate pieces that I used for
some pendants a couple of years ago. The ones I didn’t use at the
time have been kept together in a plastic tray in one of those
stacking storage boxes so they have been kept in the same conditions
away from light. They are mostly purple and a pretty turquoise/green.
Some have faded to almost gray and others have remained strongly
coloured. (I have no idea how they are coloured in the first place
but I realized they weren’t natural.) The brown and orangey coloured
pieces haven’t changed at all - I presume these are natural colours?
Can anyone advise me why some have changed and consequently how they
should be kept to avoid this?
Thanks for your help