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Try this . . .
There are several formulas for making blacks -- or VERY dark darks.
One I use a lot is burnt sienna, alizarin and ultramarine blue. By fiddling with it, you can produce warm, reddish darks that read as black, or cool, bluish darks that read as black. They will oscillate.
Replace transparent oxide red from Rembrandt and these mixes will be even more transparent.
Alizarin and viridian will give you dark darks, as will burnt umber and alilzarin, which can be cooled with blue (ultramarine or Prussian).
Prussian blue and Alizarin also produce some intense darks.
One other possibility -- lighten the values around your darks, which will make the dark seem darker.
One thing I've found is that when it gets so dark, the average viewer scans and reads the passage as black, no matter what dark color of combination it is.
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