The deep blue that now leaves a paint tube with ease was, for centuries, one of the most expensive decisions in European painting. Natural ultramarine came from lapis lazuli, largely mined in present-day Afghanistan, then crushed, purified and separated from impurities through a demanding process. Its journey from mountain mines to Mediterranean ports explains a name that literally evokes a material arriving ‘from beyond the sea’.nnThat cost shaped the painter’s palette.
Contracts could specify the quality and quantity of ultramarine reserved for important passages such as the Virgin’s mantle, while cheaper azurite served secondary areas. Blue was therefore not merely a colour: it signalled a patron’s wealth, a figure’s holiness and the material value of the picture. Painters economised by applying ultramarine in thin glazes or placing a less costly blue beneath it.nnThe invention of synthetic ultramarine in the nineteenth century broke this exclusivity.
Blue no longer depended on the budgets of courts and major churches. Colour in a painting is thus never only optical; it can carry histories of mining, long-distance trade, patronage and chemistry. The next time an intense Marian blue catches your eye, you are seeing both light and a global network of materials.
