Boy, do I love blue. I got a custom request that I thought only a Jacquard acid dye would fulfill: that’s the turquoise on the right. Then I realized my Saxon Blue could give an even better approximation of what the customer was after. That’s the turquoise on the left.
Saxon Blue is an interesting thing. Discovered in 1740, it was one of the early “synthetic” dyes. It is created by mixing natural indigo with sulfuric acid, and gives blues that are greener than those from traditional indigo vats.