Yves Klein
A couple of weeks ago, it was cold and we were working indoors; Rebecca and Dominique were over at my place and we'd fired up the wood stove for the first time. We were barcoding 1500 skeins of yarn in 6 different weights and in many colors from natural dyes and modern dyes.
We were tired and I think it was the afternoon of the 3rd day and we were on worsted Indigo blue and we had blue yarn spread all over the floor. I asked them if they knew who Yves Klein was; they shook their heads. "He was a post-war French artist who died young in the early 60's; in his Blue Period he painted all paintings—I mean every one—with one color: Blue."

Dark Indigo Blue
I remember him best for a photo of a performance piece he did in 1960.

Le Saut dans Le Vide
The girls looked at the photo and Rebecca said we should name the dark Indigo Yves Klein Blue.