Daniel Smith lunar black is the only commercial source. PBk31 is a completely lightfast, semitransparent, staining, very dark valued black pigment, manufactured by BASF as Paliogen Black. It has a slight greenish cast that becomes more apparent in tints. A perylene compound I have not been able to identify further, Holbein shadow green is the only commercial source in watercolors. PW4 is a completely lightfast, opaque, moderately staining white pigment, available from 4 manufacturers worldwide.
White pigments show almost no drying shift in watercolors.
Zinc oxide is a slightly warm shade of white and completely absorbs ultraviolet radiation at wavelengths below 370nm. The pigment itself is extremely cheap, and when watercolor manufacturers offer a single white paint, this is typically the pigment they choose. It covers reasonably well and mixes smoothly as a bodycolor with other paints. Titanium white PW6 is a completely lightfast, semiopaque, lightly staining white pigment, available from about 30 manufacturers worldwide. White pigments show almost no drying shift in watercolors.