Broken or Tertiary Colours
Make a scale between an orange red and a green blue. Try to maintain consistent tonal values across the scale by adding a little white, as in previous exercise.
I began this exercise with enthusiasm but also a low supply of ultramarine blue. As I progressed along the scale, which appeared to be going well (still in the reds) I ran out of ultramarine completely. Never fear I thought, I have a student quality Cobalt Blue, which, as previously covered was not Cobalt Blue PB28 but a mix of Ultramarine PB29 and Titanium White PW6, as I had to add a little white to maintain tone it seemed logical that this would be a good substitute for the Ultramarine. As I carried on, I was perturbed to find that instead of grey, my mixes were appearing more green. As I stared at the mixes both on the palette and on the grey ground I glanced at the tube of blue paint I had been using – Coeruleum Blue, (PB15,3/PW5/PY184) with a yellow pigment as Bismuth Vanadate Yellow that explains why I was getting more green than blue. An irritating mistake but I am pleased I know where I went wrong and can redo the process when I have new supplies.
More to come…
A little break away and then returned to this exercise using the correct blue this time.
This entire exercise was a revelation demonstrating the range of colours that may be mixed from the primaries to make secondary, and subsequently, creating tertiary colours.