In Japan, water is a symbol of purity and has always been an important subject for artists. Before the 1830s, artists used natural inks to make blue. The inks faded quickly, over time becoming dull yellow-brown and green.
In the 1830s, everything changed. Limited trade with the Dutch and Chinese brought a new synthetic pigment, called Prussian blue, to Japan from Europe. It allowed artists like Katsushika Hokusai (kat-soo-shee-kah hoh-kooseye), whose work is shown above, to create a variety of rich and durable shades of blue. The introduction of Prussian blue kicked off what contemporary scholars call the Blue Revolution.
To create the shimmering effect of moving water in The Great Wave Off Kanagawa, completed between 1830 and 1832, Hokusai uses Prussian blue and indigo. Notice how the two different blues add movement to the water.