This may be a dumb question but I could not seem to find any kind of explanation online.
When tumbling Sodalite, is there a trick to preserving its beautiful blue color? The material I have is very good…(or so I think).
If I hand polish on a diamond wheel or disk, the material will polish out with a very nice smooth sheen and the nice bright blue color with calcite veins is present.
With the same material, when tumbled or put in a vibratory tumbler, it comes out of the polish stage a much darker, almost black overall color with dark bluish veins.
So back to the saw I go with a darker piece and I cut it in half and inside is the bright blue color. What reaction is happening when tumbling to turn it a darker color???