Rublev Colours lead whites are made with basic lead carbonate (made according to modern processes) ground in oil without additives, such as stearates, a common pigment stabilizer found in all other commercial brands.
Lead paint - Wikipedia
How to choose the Perfect White for your Acrylic Painting
Using Lead White in Oil Painting with Cadmium Colors — Thimgan Hayden Studio
White Lead Pigment Powder Official Shop
One each of 60ml tubes of Michael Harding Oil Paints in Titanuim White number two (bound with linseed oil) and Warm White (lead white alternative).
Titanium White #2 and Warm White (lead white alternative) 60ml — Vicki Norman Studio
Sketching Media: Cretacolor Artists' Assorted Lead Set and Lead Holder (review)
Michael Harding Artists Oil Color - Cremintz White (Walnut), 225 ml tube, BLICK Art Materials
Lead White No. 2 50 ml
Shop Natural Pigments - French Raw Umber, Rublev Colours French Raw Umber Oil Paint
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Rublev Colours Flake White / Lead White #1 Oil Paint - Superior Quality for Artists, Natural Pigments
Lead White vs Titanium White Oil Paint #oilpaintreview