French Ultramarine

Ultramarine is certainly the most important color of my palette, I use it to mix almost every grey and also every shadow, in watercolor.

Here is a very nice article about this very special color: http://www.theparisreview.org/blog/2015/06/08/true-blue/

Lately we received a very beautiful Hortensia, and the color of it is ultramarine!
Here is a sketch of it, on black paper with Polychromos colored pencils.