How colors work: color relationships, mixing, and perception.
Test your knowledge with these top questions!
On a basic paint color wheel, which hue complements cobalt blue?
Blue and orange sit opposite each other on a basic paint wheel, creating complementary contrast.
Traditional vermilion came from which natural mineral?
Cinnabar forms in veins linked to volcanic and hot-spring activity, and artists grind the mineral into red pigment.
Which element's oxides can darken ochre toward brown?
Manganese oxides mixed with iron oxides darken ochre into brown shades such as umber.
Natural ultramarine came from which source material?
Artists purified blue lazurite from lapis lazuli, removing the rock's pale calcite and brassy pyrite.
Why can doctors give Prussian blue after cesium or thallium poisoning?
In the intestines, Prussian blue binds cesium or thallium and carries the ions out in stool before the body reabsorbs them.
How did ultramarine help laundry blueing?
A trace of blue masks residual yellow, making white textiles look whiter without cleaning or bleaching them.
"Turquoise" originally referred to what in Old French?
The Old French phrase "pierre turquoise" meant "Turkish stone," reflecting trade routes that brought turquoise through Turkey.
Ochre is best described as:
Ochre names iron-rich earth pigments, so natural deposits can range from yellow through red and brown.
In color theory, chartreuse is closest to which hue?
Chartreuse sits between yellow and green on the color wheel, so its yellow bias makes the hue look especially bright.
Synthetic ultramarine gets its blue color from which element?
The blue comes from sulfur-based ions, especially S₃⁻, trapped inside the pigment's aluminosilicate structure.