According to ochef.com a #10 can holds 13 cups I confirmed that at Mountain-Breeze.com. My own quick measurements were a bit larger but the can was old and somewhat deformed.
Instead of using a 30 volume developer you will need to just purchase a 10 volume. The 30 volume developer will lift your hair color 3 times and the 10 will lift it only 1.I do not think there is a...