For me the hardest color to find relative value for is the color red. It always looks like a mid-tone to me. It is an effective mid-tone but when an object is all red and nothing but red it is important to establish the relative value of the local color.
What I have learned so far:
Using green ...a tiny bit of green can produce some cooler reds that go down the value scale just a notch without turning into neutral grays or browns.
The other thing I discovered is Vermont made shortbread cookies that are my new passion food.
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I am a watercolor coach, watercolorist, and author. Ask me about booking a watercolor coaching session online or in-person.