It's blue, by golly.
Sacre’ Bleu!
A woman in line at a supermarket once said, "Pardon me, I'm, not trying to be forward, but you have the bluest eyes that I have ever seen," I replied, "Thank you, but yes, I know." Blue runs in my veins. God reached deep to give us such a wonderfull color.
Some years ago, barium manganate, manganese blue (Pigment Blue 33 to colourmen and chemists) was available to artists. It is the most beautiful cyan blue you can imagine, almost exactly the color of process blue. It was removed from production when it was determined its manufacturing process was too polluting. It was once used to dye concrete, but was also used in oil and watercolor paints.
I still have some tubes of it. Almost no paint companies still carry it.
Old Holland still carries it. I understand this paint company's owner bought up the last of this rare and beautiful pigment.