I consulted the abacus, and it said
I sometimes dream in colors that don't exist. By definition, there is nothing more that I can tell you about this.
So I went into the Pub, ordered a rye whisky, and rummaged around my backpack for some half-dried-out markers. Grabbed a clean napkin from the barkeep to experiment and wonder.
Experimentation is good. Try to think of a new color and then create it. To start your experiment, try to imagine layers of color adding to a new shade of brown. I imagine green, orange, and yellow for this purpose.
The color will not be new, not to us - we can't see it. But you will know when you have made a new color.