Rubiev Flake (lead) White
There is nothing like flake white, the next best is titanium, and the worst is zinc, but both "pale" in comparison to Flake. It's hard to imagine what all the masterpieces in all the museums around the world would look like today without it. Vermeer, Rembrandt, Titian, through Monet, Picasso and Georgia O'Keeffe...the list is endless. It is the warmest, most opaque, and most important, the smoothest, butteriest and of all whites mixing the best with other pigments for either the finest glazing, scumbling or medium to thick impasto.
It is so sad that is hard to find now and is very expensive. The fear that it is so dangerous and poisonous is ridiculous as it is less dangerous than other pigments like cadmiums. Got the bad rap from being a house paint which is dangerous if peeling and children under the age of 7 eat it. Oddly enough, it does taste sweet so children when teething would chew it off window sills or even their cribs which were often painted with it as it held up so well. But if you as an artist are responsible with it along with all your other paints and solvents then it poses no risk. With shipping I recently paid $93.00 for a 150ml tube of Rubiev Flake White. Yes, expensive, and I just finished cleaning my brushes for the day, and so I'm writing this review to say there is nothing that comes close to this brand of Flake white. I'll go back to the description of buttery and mixing perfectly with the other colors I used for the first tonal lay-in of sky and water for 3 landscape paintings I've just just started. I used Titanium white for the 8" x 10" studies I recently completed and the difference is so great. And beware, there is a product out there from one of the top 3 paint manufacturers called "Flake" white but is actually a combination of mostly Titanium and some Lead which I just tried on the sketches of which the 2 pigments immediately began to separate on my palette like, well, 2 very different pigments. Amazed that this well-known manufacturer would have allowed this on the market, so read the labels, also making sure they use linseed oil and not safflower. I guess it depends on the market level your working at and how much you care about quality, but for me it is worth every penny.