Power and Control Crystal:
This crystal is for those that know that real strength lies in the dark side of the force. Found in an abandoned Sith temple, these crystals were once pure white but over time became corrupted by the darkness that surrounded them. When placed in the saber one way, the pure white energy shines through showing you its pure history, but placed the other way the fully harnessed power of the dark side will shine red.
(COLORS: Red and white, VOICE: Vader 8 ball and Chirrut Imwe)
These crystals are not official Disney product.
Do not try to rewrite your crystal with an RFID reader/writer, you may brick your crystal to one color.