“It’s also true, however, that The Great Wave would not have existed without a foreign invasion. Prussian blue, the first stable blue pigment, accidentally invented around 1705 in Berlin, arrived in the ports of Nagasaki on Dutch and Chinese ships in the 1820s. Prussian Blue would start a new artistic movement in Japan, aizuri-e, woodcuts printed in bright, vivid blues.”
Openculture.com/2021/05/the-great-wave-off-kanagawa-by-hokusai-an-introduction.html