20 Volume (or 6%) developer will lift hair 2 levels and 40 Volume (or 12%) will lift hair 4 levels.
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A 20 volume developer will be sufficient for coloring facial hair, especially if there are some grays mixed in.
40 volume developer is used for high lift shades and will lift hair 4 levels. 20 volume developer is also used for lifting but will only lift 2 levels. 20 volume is used as well when going darker or for gray coverage as it lifts and deposits at the same time.
I believe 1.5 parts would be 1.5 ounces of developer to 4 ounces of color, which doesn't seem like enough developer. Double check the directions. Usually haircolor is either 1:1 or 1:2 ratio. I've never heard of 4:1.5 ratio.
between 2, 3, or 4 cm long
nothing! the only thing is that the ultra chi comes in various colors and the chi is in black. also, the regular chi is the first one to come out so its less advanced than the ultra and the ultra comes with tourmaline plates which is less damaging to your hair aswell.