Warm and cool of each color you own
Water and paper are behind us for now; this lesson moves into color, and it changes how your paintings look more than almost anything else in the course. The reason is simple and rarely taught: every color you own has a temperature. Not literally — your blue isn't warm to the touch — but every pigment leans slightly warm or slightly cool, even within its own family. You have a warm blue and a cool blue, a warm red and a cool red, the same for yellow. If you don't know which is which, you're mixing half-blind.
Why it matters
Two things depend directly on temperature:
- A good green depends on which blue and which yellow you grab.
- A clean purple depends on which red and which blue.
Grab the wrong pairing and you get mud instead of clean color — and not the on-purpose kind we'll cover later, the sad accidental kind. So today's job is to sort your six colors into warm and cool before mixing anything.
How to tell warm from cool
- Squeeze or wet out every color you've got — a small dab of each on scrap cheap paper, spaced apart.
- Ask one question of each: does it lean toward yellow, or toward blue? A warm red (something like a cadmium red or a scarlet) has a little orange hiding in it. A cool red (something like alizarin or a quinacridone rose) has a little purple hiding in it. Same logic for blue and yellow.
- If you're unsure, drop a tiny bit next to plain water on the palette and let it thin out. Diluted color tells the truth faster than concentrated color does.
- Write it down. Actually pencil "warm" or "cool" next to each pan or tube label. You'll forget by next week — I still double-check mine sometimes.
The mixing test
Once they're sorted, run this:
- Mix your warm blue with your warm yellow. Look at the green.
- Mix your cool blue with your cool yellow. Look at that green.
- Mix warm blue with cool yellow, then cool blue with warm yellow.
Two blues and two yellows give you four different greens — that's the whole lesson in one exercise. The same logic works for oranges (red plus yellow) and purples (red plus blue).
As a rule, the cleanest, most vibrant mixes come from pairing warm-with-warm or cool-with-cool. Cross a warm and a cool and you get a duller, grayer version — not wrong, just different, and sometimes duller is exactly what you want.
Which brings up the mountains. Last summer I tried painting the point of the mountain from my back patio and it came out a green blob — just a shape, no life to it. Steven walked by, tilted his head, and asked "is that the point of the mountain." Technically yes, but it didn't feel like it. The problem wasn't the drawing; it was one flat green slapped on straight from the mix. Real foothills aren't one green. They shift warm-to-cool with the light and the season, and by August everything's dried out to a dusty gold-green. Once I mixed a warmer green for the sunlit parts and a cooler green for the shadowed folds, the same shape read as a mountain instead of a blob. Same drawing, different temperature choices. That's the whole trick.
A note on mud
Stated as an opinion: mud is fine. People panic the moment a mix goes grayish and assume they've ruined it. Sometimes you have — but a lot of the time that grayed-down color is exactly what real landscape looks like, especially dry-grass hillsides in late summer here. Learn which warm-and-cool pairing makes mud so you can reach for it on purpose instead of fearing your own palette.
Try this at home
- Sort your six colors into warm and cool.
- Mix every possible green, orange, and purple combination on a scrap page.
- Label each one and keep the page. It becomes your cheat sheet — more useful than any color wheel poster.
One caution: let each little mix dry before you judge it. Wet color always looks more saturated than it dries, and with how fast things dry here you'll be tempted to judge too early. Wait it out.
Before next time: bring your labeled color-temperature swatch page back — we'll use it directly when we start mixing greens for real next lesson.