Blanch (Yellow)

When this hits a hero, cards they own lose all colors until the end of their next turn.

If you come under the effect of Blanch, the color of cards used in any historical actions taken beforehand are not affected by Blanch’s effect for the purposes of rules and effects. For example, if you defend with a blue card, then Blanch hits you, it does not change the fact if you defended with a blue card that turn.
Cards you play that are owned by another hero do not lose their colors if you are under the effect of Blanch.
The effect does not trigger if you hit anything other than a hero (i.e. an ally).
Losing colors does not modify pitch values. Pitching a colorless card gives you the same number of or as it would if it did have a color.