Prussian Blue: The Color That Changed the World

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Starry Night by Vincent Van Gogh, oil painting

02 October 2018 | | Artist Network

“And that is how I caught Cézanne off guard, coming along bent over in thought. His face like a potter’s, sun-burned, looked startled as the shadow of nearby leaves played over it. He had a small, bony head with rosy skin, lively eyes, and a white mustache, carelessly smeared with prussian blue.”

~Jules Borély, Conversations with Cézanne

A Paint More Costly Than Gold

It is hard for artists, spoiled as we are by the easy availability of all the colors of the rainbow, to imagine a world wherein one of our important and necessary colors costs more than gold.

But that was the world before 1703. The strongest and most useful permanent blue at that time was ultramarine. The name comes from the words “oltre marino”—referring to it being brought from “over the sea.”

So expensive was it that many artists had to rely on their wealthy clients to buy it for them or otherwise go without.

In 1703, however, all that changed. A new blue was accidentally created that could be made by anyone who knew the “secret” formula. The color maker who discovered it, Johann Diesbach, wasn’t even trying to make a blue paint. He’d been mixing a standard red lake, made from cochineal.

An Accidental Mix

The story goes that Diesbach was late with a customer’s order and rushing to complete the job. To make the red, he needed dried cochineal, iron sulfate and potash. Fortunately for future artists, he didn’t have potash on hand.

Potash is an alkalai—what is known as a mordant—necessary to make the color attach to fibers and become permanent.

There are several urban legend-style versions attesting to what happened next, but the result was that Diesbach got his hands on some contaminated potash, which, when combined with the cochineal and iron sulfate mixture turned blue instead of red.

A New Blue — Prussian Blue

When he saw this, Diesbach forgot all about making red and began to experiment to determine how this new blue had occurred. What he had accidentally created was a chemical reaction so complicated that it might not have been discovered at all for many years.

Apparently, the potash he used had animal blood in it, which contains iron. The iron had reacted with the potash to change the potash into potassium ferrocyanide. When he mixed this with the iron sulfate, he accidentally created another compound, iron ferrocyanide—what we know as Prussian Blue. Even though he knew how to create it, he still had no idea why it had turned blue.

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Under the Wave off Kanagawa by Katsushika Hokusai, woodblock print

Initially, Diesbach kept the formula to himself, but the fellow who may have sold him the contaminated potash, Johann Konrad Dippel, sorted it out and by 1710, was selling the new color himself.

It was an instant sensation. Part of the reason was for this new paint’s deep, intense blue, great transparency and great strength, but also because it was a tenth of the price of ultramarine blue.

Because it was the first truly synthetic color, it was easy to supply it to artists worldwide, who’d been waiting for literally centuries for a strong, non-toxic blue. It is also credited with reviving the Japanese woodblock industry, which then influenced the French Impressionists, whose work and colors inspired so much of modern art–all thanks to prussian blue!

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Original Link: The Color That Changed the World

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