As for true color. This is becoming more and more difficult. But when you feel certain that a bead is old, the color is more likely to be untreated.

People sometimes ask me "How can you tell the difference between old and new?" I recommend buying the beads you know are new so that you can train your eye to identify the new ones. Then you will have a head start trying to find clues of antiquity in the ones which do not fit the mold.

Frederick