Measuring by volume is a way of making your wax look like it has a lot more carnauba than it really does. As others have already said some manfacturers use this to mean that it is the percentage of the wax content, rather than total product, which is carnauba. Others may say it means something else.
One problem is we don't know if they all measure the same way and use the same criteria. When is the wax measured? when it is in it's raw solid state, when it's in flake form, when it's powdered, when it's hot, when it's cold. It's weight will remain constant throughout, but it's volume will change depending on what state it's in.
If you were to take 70g of raw carnauba flakes and melt it and then add 30g of solvent, then let it cool, you would be left with of a brick of wax that was so hard you would never be able to apply it. Even warming in your hands first won't get that going. But you will have nera enough 100g of wax and a true 70% carnauba.
If you were to take 70ml of raw carnauba flakes and melt it and then add 30ml of solvent, then let it cool, you will most likely have a wax that was soft enough to do something with. You still wouldn't want to use it though as it it will need some oils and stuff to help it spread and give you the desired look. But the bigger point is you will not be left with either 100g of wax or 100ml of wax so you don;t have a true 70% carnauba, like the first example.
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