Do you mean to use gray instead of black? Is it because naturally black
contains some hue/tint and it is better to use grays that have been mixed
to
neutral? If so, could you recommend some brands/names for grays?
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Neutral Tint is a pigment that looks black and not grey. It is a mixture
of other colours that will darken without degrading pigments with which it
is mixed. I used to mix burnt sienna with Indigo to achieve a black until I
dicovered Neutral Tint. The grey I use is Davy's Grey ( ground slate )
which is a good neutral for cooling down warm colours.
Terry King