If my memory serves me correctly, here is some info on the different whites. I not positive this is all accurate since I'm trusting my memory (yikes). If I find different info I will let you know.
Titanium is more opaque and slower drying. Zinc is transparent and cooler in color. Flake white is lead base and warmer in color, and faster drying. Flake white is also stiff, however Vasari paints have a creamy flake white that I tried and liked. I think Permalba is actually more a brand name for a white that is a titanium-zinc combination. Permalba is also very buttery. Cremnitz I am not sure about. The white I like best is a Titanium-zinc combination from Gamblin.
Hope this helps
Mary
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