How do i mix wellla's color charm haircolor how much 20 cream developer do mix with the dye?

take it from a hair couloring specialist: Mix one part Activating lotion, with one part hair colour. Let sit for 15-20 mins. rinse. This is by far the best hair colouring product I have ever used! Good luck.

CAN YOU USE THE 30 VOLUME CREME DEVELOPER INSTEAD OF HE ACTIVATING LOTION?