How Can Red Be a Cool Color? Warm vs Cool Reds in Watercolor

Red can be a cool color because every red has a color bias, a lean toward either warm or cool. Cadmium red is a warm red because it has a little orange in it, while carmine and rose lean cool. Rose might look pink, but it is an extremely cool red.

Why This Matters

It is easy to assume red is always warm. But every red has a color bias, so some reds lean toward orange and others lean the other way, toward purple.

A color wheel can hide the cool reds. It goes straight from red to purple, so there is no obvious place for a cool red to sit. That can make it seem like every red must be warm, when really the cool reds are the ones leaning toward the purple side.

Your palette may also include earthy reds like English Venetian, which have their own bias to sort.

Try This

Lay out every red you own and sort them into a warm group and a cool group. Look for a touch of orange. If you see it, the red is warm. If it leans toward purple or pink, it is cool.

Swatch your reds side by side on a scrap of paper so you can compare them directly, and label each one so you remember where it landed. Rose is a good one to test, since it looks pink but sits on the cool end.

Want to Go Deeper?

If you want to see how color bias works across all your colors, this related read goes further into why some colors lean warm and others lean cool.

What Is Color Bias in Watercolor? (And Why It Causes Muddy Colors)

Want to See the Color Bias of More Colors?

My free Color Companion is a guide that lists out the color bias of some of the most popular colors, a good place to keep exploring if you want to see where more of your paints land.

👉 Get the Free Color Companion

If you're curious about my overall approach to teaching watercolor, you can find that on my about page.