Fundamentals of color in weaving: Why Your Colors Went Muddy (And How to Predict It Before You Weave)

Note: This post replaces the earlier article on the Two-Primary Rule, which contained inaccurate information. The article below is the result of considerably more research into the science of optical mixing.

We’ve discussed how to control how much your colors blend in Color Mixing. But we didn’t cover the other half of color mixing: When your colors do mix, what color do you actually get?

More specifically: you chose two beautiful, vivid colors. Why did your finished cloth come out dull and flat?

Muddiness is saturation loss

Here’s what’s happening. When two colors optically mix in cloth, the result is nearly always duller than either parent color. If the colors are close together on the color wheel, it might be only a little duller. If the colors are far apart, you get what colorists call “saturation loss”.

Of course, we weavers call it by a different name: mud!

The main culprit: hue distance

The single most reliable predictor of muddiness is hue distance – how far apart your two colors sit on the color wheel.

The farther apart they are, the more saturation the blend loses. It slides gradually as the colors get more distant from each other:

• Within about 60°: Minimal loss. The blend stays vivid. Blue and green make a lovely teal; red and orange make a beautiful red-orange.
• Between 60° and 120°: Noticeable dulling. The hue is still recognizable, but some of the life is gone.
• Beyond 120°: Significant dulling. The blend looks grayish.
• Directly opposite (complementary colors, ~180°): Maximum saturation loss. This is the classic “surprise mud” – two vivid colors that produce a nearly gray result.

That last one surprises a lot of weavers, because complementary colors look gorgeous together on paper. Magenta and green. Blue paired with yellow. Purple with a pop of lime. The contrast is beautiful. Then you weave them together:

[DAWN: PUT THE TWO YARN SWATCHES SIDE BY SIDE and the cloth swatches underneath]

Oops! What went wrong???

Nothing went wrong. Optical mixing blends colors together, and complementary colors blend to dull gray. Sticking closer together on the color wheel will minimize mud.

Also: how saturated are your yarns to begin with?

Hue distance is the biggest factor, but the saturation of the original yarn matters too.

If your yarns are already low-saturation – grayed out, like steel gray rather than sapphire blue – the blend will be duller than if you’d started with saturated colors. There’s simply less saturation to preserve going in.

Two vivid, highly saturated colors at moderate hue distance will produce a dull blend, but it’ll still have some liveliness. Two already-grayed colors at the same distance will produce something much closer to gray.

Two quick checks before you wind your warp

If your colors will blend (they don’t always – see the class Color Mixing for details), you can assess your muddiness risk in about two minutes.

Check 1: Hue distance. Find your two colors on the color wheel. How far apart are they? Within 60°, you’re in good shape. Between 60° and 120°, expect some dulling. Beyond 120°, expect significant dulling. Directly opposite? Expect mud.

Check 2: Yarn saturation. Are your yarns vivid and saturated, or muted and dusty? The more muted they are, the more the blend will dull – on top of whatever hue distance is already predicting.

That’s it. If both checks look fine, you’re probably okay. If one raises a flag, you can change your yarn colors – or change to a draft that doesn’t mix colors, which will also fix things.

What to do when you’re predicting mud

If the two-check test is pointing toward mud and that’s not what you want, you have options. The two simplest ones are:

Choose closer hues. The most direct fix: reduce the hue distance. Red and green will produce mud; red and yellow-green, or red-orange and green, will be less muddy. So choose warp and weft colors that are close on the color wheel.

Use a separating draft. Your draft structure controls what percentage of the cloth surface shows warp versus weft. 

A balanced plain weave produces a 50/50 mix of warp and weft colors – a sure recipe for mud if your colors are far apart on the color wheel. However, 3/1 twill shows about 75% warp and only 25% weft. The more warp (or weft) dominant the structure, the less influence the other color has.

Red and green in a 3/1 twill reads mostly red or green with a slight dulling from the other color. A separating draft has areas of warp dominance and areas of weft dominance with very few areas of equally blended color. This is why twill blocks preserve colors and 2/2 twill dulls them.

Sometimes mud is exactly what you want

Of course, muddiness isn’t always the enemy!

Rich browns, warm grays, complex neutrals, tweedy textures, heathered yarns – all of these come from controlled color blending. The trick is doing it on purpose instead of discovering it after the fact.

Once you can predict muddiness, you can use it. Those complementary colors that produce mud? They might be perfect for that heathered blue-gray you wanted.

One thing to keep in mind

Everything above assumes your draft is causing your colors to optically mix. Not all drafts do that.

If your structure keeps warp and weft visually separate – distinct warp dominant areas and weft dominant areas rather than a blended color – hue distance doesn’t matter much. You’re not blending; you’re placing colors next to each other, and larger patches won’t optically mix. Everything we’ve discussed only matters if your colors are blending.

See our class Color Mixing to read up on controlling color blending!