What Do I Do If I Get This Job?
Jobs & Education0 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.You won't get a really dark black by mixing but you can get a very dark grey by mixing blue + red + some yellow. You have to juggle the proportions to get a neutral gray. If it is too brown - add some blue, too green - add red, too purple - add yellow. It does depend a bit on which red/blue/yellow you mix.
Scientifically, the best three to use are magenta + cyan + yellow.
Although you can get tubes of black watercolour paint (eg Ivory Black) I find these rather harsh for delicate watercolour painting. Also there are generally no real blacks in the environment - even the darkest corners have a colour bias. Some artists use a neutral gray and I have often used Payne's Gray as a quick way of getting dark colours. Beware though because Payne's Gray is a staining colour and will not lift off again if you make a mistake.