A Chemist Accidentally Creates A New Blue. Then What?
Mas Subramanian wasn't expecting blue.
In 2009, as part of his lab at Oregon State University, Subramanian — a professor of materials science — was working with students to manufacture new materials that could be used in electronics. They would mix and grind chemicals, then heat them to over 2000 degrees Fahrenheit.
One grad student, Andrew E. Smith, took a particular mix out of the furnace to find it had turned a surprising, bright blue color.
"You know what Louis Pasteur said?" Subramanian asks. "Luck favors the alert mind."
Pasteur, the French chemist and microbiologist, famously created a vaccine to chicken cholera by accident. Smith and Subramanian, as it turns out, stumbled upon an undiscovered pigment of blue — the first new blue in over 200 years.
Subramanian knew immediately it was a big deal.
"People have been looking for a good, durable blue color for a couple of centuries," he says.
What's in a pigment?
Before getting into why this blue was so special, let's talk for a moment about light and metal.
"Color is a part of a spectrum, so you can't discover a color," Subramanian says. "You can only discover a material that is a particular color."
That spectrum is red, orange, yellow, green, blue, and violet — no indigo. A pigment is a material that absorbs certain parts of the color spectrum and reflects others.
In this case the material — "YInMn blue," named after its chemical makeup of yttrium, indium and manganese oxides — absorbed red and green wavelengths and reflected blue wavelengths in such a way that it came off looking a very bright blue.
Now, this particular blue is considered a "complex inorganic pigment."
According to Geoffrey Peake, R&D manager at The Shepherd Color Co., that means it's not a naturally occurring pigment (such as ultramarine, which comes from the rock lapis lazuli). Rather, it derives from a mix of various metal oxides — a metal element combined with oxygen.
"In our systems, blue is one of the most highly requested color families," says Brooks Tippett, vice president of operations at the Pantone color company.
The reason for both the above is that blue pigments are difficult and expensive to extract from nature. Lapis lazuli, for one, is mined mostly in Afghanistan and Pakistan. So synthetic pigments are easier to manufacture in bulk, and much more durable.
The last new complex inorganic blue pigment to be commercially manufactured was cobalt blue — a mix of cobalt and aluminum oxides — in the early 19th century. Cobalt, however, can be toxic if ingested in large quantities, and it doesn't reflect heat particularly well. It fades over time.
Those aren't terrible downsides, as colors go. But if a better one happens to fall into their laps?
Blue is the coolest color
Subramanian and Smith, along with OSU chemistry professor Arthur Sleight, filed to patent the YInMn material before publishing a paper on their discovery with other collaborators in the Journal of the American Chemical Society .
Soon after, Peake says, Shepherd Color contacted OSU about testing out the pigment.
"I know from my experience — there will be a potential for commercialization," Subramanian says.
Shepherd, unlike a company like Pantone, isn't concerned with fashion, art, or other personal uses. It deals with paints and plastics that are made to be durable, used for outdoor applications like roofing and siding.
"It's not like Joe Artist can call us up," Peake says.
(That's why the blue isn't called anything more exciting than YInMn yet. When you're an industrial manufacturer, Peake says, "it doesn't seem necessary to have a catchier name.")
Shepherd looks for four main things in a new pigment, Peake says: Is it a stronger color than what's already available? Can it withstand elements like weather and heat? Are there cost advantages? And will they encounter any regulatory or environmental issues?
"Immediately they said this was really an exceptional blue, because it reflects heat more than cobalt blue, it's really stable and it's a really great color like lapis lazuli," Subramanian says.
Shepherd's tests — turning it into paints and plastics, using it on ceramics and metals — also showed YInMn can endure oil, water and sunlight better than other available blues.
Once the Environmental Protection Agency approves YInMn for commercial manufacturing, Shepherd can begin selling it to other companies. For every kilogram of the pigment the company sells, Peake says, Shepherd pays a royalty to OSU.
Think of this like a record deal. Subramanian's team and OSU wrote and own the tune, but Shepherd will market and distribute it — they'll try to make it a hit. And a new hit in the color industry is a rare thing.
"I've been doing this job for 27 years, and maybe worldwide there have been five or six new inorganic pigments that have been commercialized over that time period," Peake says.
A broader palette
Not that people aren't always searching for more color.
Peake says Shepherd has a research and development lab that works methodically to invent new pigment chemistries. In 2012, it introduced NTP Yellow, which the company patented and now sells.
Subramanian's current project includes a search for a better red pigment, which would be in high demand if found. Red tends to come from heavy metals or other toxic substances, like mercury and lead.
And Pantone — famous for its Color of the Year contest — regularly releases new shades into its standardized color systems. But according to Tippett, the Pantone vice president, those are primarily aimed at designers and the fashion and interiors industries, and based off a common, small group of pigments.
"Though we do have thousands of colors already, it never fails to surprise us that the No. 1 request from customers is they want more color," Tippett says.
Even though Pantone has yet to license YInMn itself, Tippett says the company is excited about all the possibilities a new pigment will hold. After all, it's not just the one blue that it provides, but a whole spectrum of colors it could be mixed to create.
Actually, Subramanian has already started doing that. Adding titanium and zinc to the YInMn mix makes a purple material; oranges and yellows and greens will soon follow.
Narayan Khandekar, caretaker of the Forbes Pigment Collection at the Harvard Art Museum, obtained samples of YInMn blue for display and plans to include Subramanian's other creations soon.
Khandekar says he looks forward to when these new color possibilities find their ways into the hands of artists. That's when he thinks people will really see the significance of YInMn.
"I think generally people take color for granted," Khandekar says. "They walk around without thinking that every color they see — every car, every piece of plastic — has a piece of dye in it that somebody found and figured out how to make. When you put pigments in art, people stop and pay attention to it."
Copyright 2020 NPR. To see more, visit https://www.npr.org.