Blue-Purple Force Lightning

In Star Wars canon, this has been used by Darth Sidious, Count Dooku/Darth Tyranus, Supreme Leader Snoke, and Rey.

Is Palpatine's lightning blue or purple?

Palpatine's lightning was purple mized with blue, and it clearly seemed more potent than the blue. Yoda could absorb Dooku's blue lightning, but he couldn't handle Palpatine's purple. Red force lighting is seen in TCW, used by the Son, in TFU use by Luke, and in a picture of Darth Tenebrous.

What color is Jedi lightning?

Force lightning occurred in at least four colors; blue, green, yellow, and red. The typical form was a bluish-purple version as demonstrated by Darth Sidious, Darth Tyranus, Snoke and Rey; Nightsister magick equivalents were green like magical ichor as demonstrated by Mother Talzin.