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Originally Posted by Michele Rushworth
. . . flake white it feels like I'm painting with skim milk. . . black areas that seem to take forever to dry.
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As with any other pigment, there are a lot of variations with differing pigment loads. Vasari flake is very good. Robert Doak offers a number of variations, SP is also very high quality. Naturally, flake is more transparent, while titanium is as opaque as one can find. Lead whites dry more rapidly, titanium is exceedingly slow.
Carbon blacks absorb much more oil than almost any other pigment. They also tend to be slow driers. Prussian blue and the umbers naturally contain manganese compounds, and dry rapidly. Mixes of the two can provide a rapid drying "black" that's almost as dark as carbon blacks from the tube.