Gold

Symbolism

Across nearly every civilisation that used it, gold has signified the incorruptible, the divine, and the eternal, precisely because the metal does not decay. In ancient Egypt gold was considered the flesh of the sun god Ra and the imperishable substance of the gods, which is why pharaohs like Tutankhamun were entombed in solid gold death masks meant to guarantee immortality. Byzantine theologians interpreted gold-ground mosaics not as mere opulence but as a symbol of transcendent, uncreated light emanating from heaven, collapsing the distinction between the sacred image and the divine presence it depicted. In medieval and Renaissance Christian art, gold haloes and backgrounds signalled holiness and set religious figures outside ordinary earthly space and time. In secular contexts from Klimt's Vienna to contemporary luxury branding, gold has come to signify wealth, status, and sensuous excess, a meaning that runs parallel to, and sometimes in tension with, its older sacred associations.

Pigment history

True gold was never a conventional ground pigment but a literal precious metal applied as leaf, shell gold, or powder, which made cost and material scarcity central to its history: gold leaf could be beaten thin enough that a small amount of bullion covered a large surface, meaning gilding was often cheaper in practice than ultramarine blue made from lapis lazuli. Shell gold was produced from goldsmiths' scrap and worn gold-leaf fragments, ground with honey to prevent the flakes from clumping, then washed clean and bound with gum arabic — a resourceful medieval recycling process reserved for fine highlights and manuscript illumination. Gilding required elaborate preparatory layers, especially bole, a reddish clay bed that both cushioned the leaf for burnishing and imparted a warm glow beneath the metal. Because genuine gold was expensive and technically demanding to apply, painters frequently substituted yellow ochre, orpiment (a toxic arsenic sulfide), or later Naples yellow and chrome yellow to suggest gold's colour without its cost. The rise of oil painting and naturalistic pictorial space in the fifteenth century made flat gold grounds seem archaic, and by the Baroque era gold survived mainly in frames, devotional objects, and decorative arts rather than as a painting surface itself.