Crimson & Yellow & Cerulean

Crimson is the iron-oxide manganese — the deep vivid warm-red of the iron oxide and manganese dioxide pigment combination used in Italian majolica for the deepest and most passionate reds and crimsons. The history of red in Italian ceramics spans from the earliest Archaic period through the Byzantine period to the Renaissance majolica peak — but the specific deep crimson of the Renaissance polychrome tradition achieves its character through the careful firing temperature (1000-1050°C) and the specific combination of iron and manganese that creates the most saturated and most deeply warm red available in ceramic chemistry. The Maestro Giorgio Andreoli workshop in Gubbio (active approximately 1495-1555) achieved the most celebrated crimson-lustred majolica pieces — the Gubbio lustre is a gold-and-ruby-red metallic surface produced by in-situ reduction firing. Yellow is the Naples Yellow — the vivid solar yellow of antimony lead oxide (Pb₂Sb₂O₇, lead antimonate, historically called Naples Yellow or Giallorino), the oldest known synthetic pigment and the most celebrated yellow in Italian Renaissance ceramic production. Naples Yellow was produced in the Vesuvian region (near Naples) from at least the 14th century and was the primary vivid yellow of Italian majolica before the 19th-century synthetic dye revolution. The specific vivid warm yellow of Naples Yellow appears in the most celebrated polychrome majolica as both a primary color and as the underlayer for other warm tones. Cerulean is the cobalt aluminate — the clear atmospherically vivid blue of cobalt aluminate (CoAl₂O₄), also called cerulean blue or cobalt cerulean, which was used in Italian ceramics from the early Renaissance as a stable, kiln-safe blue. The specific cerulean blue of Italian majolica — slightly more blue-green than cobalt oxide, more atmospherically clear than ultramarine — creates the most distinctive and most immediately recognizable cool element of the Italian polychrome tradition.