Color Charm Permanent Gel Haircolor

What's the difference between wella colorcharm cream developer 40 o4 20 volumn is used for 4r/356 hair color?

This can be used as a superlightener the 12A?

Will "4nw med natural warm brown" be restocked?

What happened to wella color charm gel 911/9n, very light blonde? i no longer see it on your listing.