To lighten the soles, do you guys use the vol. 40 crème or the vol. 40 clear?
https://www.sallybeauty.com/hair-color/other-products-and-applications/developer/40-volume-creme-developer/SLNCAR63.html
https://www.sallybeauty.com/hair-color/shop-all-hair-color/40-volume-clear-developer/SBS-760625.html