Against a deep blue backdrop, sword-wielding demons attempt to disrupt a sacred ritual. Ram, who is dressed in a yellow dhoti and rendered in a shade of blue distinct from the background, rains arrows on them. Lakshmana ably assists him. The demons seep vermillion blood.

This 18th-19th century Rajasthani miniature, Demons Approaching Rama and Lakshmana at a Fire Ceremony , does not just capture a charged moment from the Ramayana where ritual and battle converge. It is a snapshot of global trade and cultural exchange in the 1800s.

The dominant pigment in the painting is Prussian blue, invented in Berlin around 1706. It was soon manufactured across Europe, and exported to Asia. In Japan, Hokusai used it to create The Great Wave of Kanagawa (1831) – the iconic image that is a po

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