I don't think it's an exact science (I never treated it as such), I just used to wait until my conditioner was roughly half empty, then squidge as much dye as I could into the bottle, and stir it with what I later found out was a much cherished antique chopstick
(who the fuck has antique chopsticks anyway? )
BTW, most of my dye jobs were a result of me trying to go platinum blonde, failing, and having to do something with my hair.
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