It was believed that the colours of the 'planets' derived from the minerals that emanated from them, lead from Saturn, copper from Venus, iron from Mars, Mercury from Mercury, tin from Jupiter, gold from the Sun and silver from the Moon. The more recently discovered planets had colours attributed to them according to the personal inclinations of the practitioner.

Colours attributed to 'Planets', their Minerals and Meanings (15thc.)

PLANET	COLOUR	MINERAL	MEANING
SUN / Gold	Yellow	Gold	Richness
MARS	Red	Iron	Pride
MOON	White / Silver	Copper	Justice and Loyalty
MERCURY	Purple	Tin	Abundance of good things
VENUS	Green	Quicksilver	Pleasure
SATURN	Black	Black	Simplicity

List made in the 1430's by the Herald, Jacques Courtois, for King Alfonso V of Aragon. Courtois also gave the colours of the months of the year:

JANUARY	White	FEBRUARY	Turquoise
MARCH	Tan	APRIL	Verdigris
MAY	Green	JUNE	Carnelian
JULY	Red	AUGUST	Golden
SEPTEMBER	Blue	OCTOBER	Violet
NOVEMBER	Purple	DECEMBER	Black