Hi Arthur,
I would suggest you look at the colors you use. For example, Burnt Umber (ugh) is notorious for sinking in and 'deadening' as is Black. I only use straight black in the pupils. I mix it otherwise, using something like alizarin, ultramarine, sometimes a little raw umber. Raw umber is my 'brown' of choice.
Liquin is my current medium. I rarely see that sinking in with my colors.
Everyone has their own formula. Try different things and see what you're comfortable with.
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