Hiroshige Blue: How Prussian Blue Changed Edo Ukiyo-e

Guide ⋮⋮ The Mechanics of Hiroshige Blue｜ The Aesthetic Loop ｜ Continue Reading

Bero Blue

A Foreign Colour That Turned Edo

The secret behind “Hiroshige Blue” is actually an imported pigment: Prussian Blue. In the early 19th century, the Japanese called it Bero-ai (Berlin Blue), named after its European city of origin.

Before Prussian Blue arrived, artists used organic indigo. But indigo was difficult to work with; its coarse particles didn’t always stick to the paper, and the color often faded over time.

Prussian Blue was a game-changer. Its particles were incredibly fine, allowing it to soak deep into the fibers of the handmade Washi paper. Because the color was so stable, artists could finally control the intensity and layers of the blue with surgical precision. This “exotic” blue quickly became the most important color in the Edo art world.

How was it made? The Team Behind the Blue

Hiroshige Blue wasn’t the work of a lone genius. It was a high-stakes collaboration between three people: the Artist (who designed it), the Carver (who cut the wood), and the Printer (who applied the color).

The Secret of Layers

To get that deep sense of distance, the printer used multiple woodblocks. They would start with a very faint wash of blue to set a “moist” mood, then add the main areas of color. To make the blue even deeper, they would press the paper onto the same block multiple times. This is why the rivers in Hiroshige’s prints look like you could dive right into them.

Bokashi: The Magic Fade

The most famous feature of Hiroshige Blue is Bokashi—those beautiful, soft gradients. To do this, the printer had to be a master of moisture. They would apply water to the woodblock so the blue would bleed naturally across the paper. In some areas, they even wiped the block with a damp cloth to make the blue vanish like mist.

The Blue Header (Ichimonji)

Have you noticed the dark blue band at the very top of many Hiroshige prints? That’s called Ichimonji-zuri. It isn’t just a “sky”—it’s a tool to focus your eyes. By placing that dark blue at the top, Hiroshige creates a window-like effect, pushing the center of the image back and giving a flat piece of paper a sense of incredible depth.

Hiroshige is often called the “Artist of Rain, Snow, and Moon.” His blues capture the very “feeling” of the air—the humidity of a morning fog or the chill of a twilight sky. In his famous Sudden Rain at Shōno, the layers of blue and grey are so atmospheric you can almost feel the dampness of the storm.

These colors aren’t just pretty; they are emotional. They create a sense of Yūgen—a profound, quiet beauty that invites the viewer to step away from the noise of the world and into a moment of stillness.

Spotlight: Sudden Shower over Shin-Ōhashi bridge and Atake

In this masterpiece (famously copied by Vincent van Gogh!), we see Hiroshige Blue at its best.

Look at the top of the print: the nearly black blue header creates a heavy, stormy sky. The river below is a deep, jewel-like blue that stays perfectly calm even as the rain slashes down in sharp lines. While the people on the bridge are running in a panic, the blue water remains steady.

It’s a reminder that even when the world is chaotic, there is a foundation of silence underneath it all.

Prussian Blue was a European invention that found its most sophisticated expression in Japan. Once it was amplified by the woodblock system, it was exported back to the West, where it fundamentally changed how Europe understood color and landscape through Japonisme.

Hiroshige Blue isn’t a “Japanese” blue. It’s the color of a global aesthetic exchange.

Where the View Ends

Hiroshige Blue is more than a pigment; it is the sediment of technical mastery. It is as vast as the sea and as small as a drop of rain. It doesn’t perform for us; it simply is, granting the landscape a depth that rewards a long, patient gaze.

In this blue, the noise of our lives recedes. The air remains. That blue becomes the background that allows the world to finally be seen.