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.
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if the substance of the element has greater density you can make it float by carving it out so weight over volume of the object is lighter in effective density
A lighter gray.
Mixing 10 Volume developer and 40 volume developer will never make a 20 volume regardless of how much is mixed. In order to make a 20 volume, equal parts of 10 and 30 volumes will need to be mixed. Mixing 10 and 40 will make 30 volume.
The only way to make a 20 volume would be to mix equal parts of 30 and 10 volumes.
A cylinder can be made of almost any material and that material will then make up its volume.