Winsor and Newton has been making paint for artists for the past 180 years. Each color is made to have stable color. The company makes sure that the quality control process keeps the paint ready to be what artists need and want. All their paint becomes touch dry within two to twelve days.
The W&N Mars black has been a work of love. The most current modification has increased color strength offering a greater tinting ability and improved covering power.
Mars black was developed in the twentieth century and is considered non-toxic. Artists rate it the best black for opacity, light fastness, and permanence. The pigment is ferrous ferric oxide (Fe3O4). That is the reason it is named Mars, which was the patron of iron.