Purify

Purify was a Force Power which allowed the user to remove the taint of the Dark Side of the Force from lightsaber crystals. A telltale sign of purify being used is if any Sith lightsaber crystals drew out a white blade instead of the usual red blade, due to the red lightsaber blade being a result of the crystals being made to "bleed" by the Dark Side. Ahsoka Tano utilized them on the Sixth Brother's kyber crystals during an encounter with him, harmonizing them into working for her.

Behind the scenes
In the Legends novel Riptide, Jaden Korr performed a similar technique where he changed a red crystal into a yellow one.

Appearances

 * Ahsoka