Why Cheddar Is Orange: The Colour That Hid Skimmed Cream

Cut a wheel of cheddar from Vermont and it is often pale. Cut a block from a Wisconsin supermarket shelf and it is orange. Same cheese style, same milk animal, different colour. Neither is wrong, and the gap between them says a lot about how a colour becomes a promise.

Here is the odd part. Cow's milk has no orange pigment of its own. The orange in your cheddar was put there on purpose, and the story of why starts with grass.

Where the first orange came from

Grass is rich in beta-carotene, a pigment that dissolves in fat. A cow that grazes in summer passes some of it into her milk fat, and the milk takes on a yellow tint. Jersey and Guernsey cows are known for this, and their cream carries a visible golden cast. NPR's account of the history describes English cheeses with a natural yellow-orange tint from exactly that diet, and says the colour was read as a sign of quality.

The season mattered too. A food science explainer from the University of West London notes that summer milk from grass-fed cows is yellow from beta-carotene, while the hay and silage of winter feeding give much less of it (University of West London). So the same dairy could make a golden cheese in June and a pale one in January.

Colour was information. A buyer could see richness before tasting a crumb.

The cream got sold, and the cheese went white

Then came a commercial twist. Paul Kindstedt, a cheese historian at the University of Vermont, explains that English cheesemakers in the 17th century found they could earn more by skimming the cream off the milk to sell or turn into butter. The pigment travels in the fat. Skim the fat and you skim the colour.

The cheese that remained was pale and lower in fat. Customers, particularly in London, expected the golden version. Kindstedt puts the motive bluntly: "The cheesemakers were initially trying to trick people to mask the white color." (NPR).

So makers reached for dyes. The list in that account is saffron, marigold and carrot juice, and later annatto.

Sources do not agree on the exact timeline. Some tie the practice to the 16th and 17th centuries and south-west England. Others reach back further. The safe version is that colouring skimmed cheese was an established trick by the 1600s and that annatto came to dominate afterwards.

Meet annatto, the seed that won

Annatto comes from the seeds of Bixa orellana, a shrub native to South America. The University of West London piece says cheesemakers used it from the 18th century, after it turned up among imported goods. It is a yellow-orange carotenoid, so it behaves a lot like the grass pigment it replaced.

An illustrative ramp, not measured from any cheese: from unskimmed pale curd on the left to a heavily annatto-dyed block on the right.

It suited the job for practical reasons. The same explainer says annatto does not directly change flavour. It also reports that in coloured cheddar roughly 80% of the annatto stays in the curd while about 20% drains away in the whey, citing food chemistry research by Zhu and Damodaran (2012). Most of what goes in stays in the cheese.

The colour does more than copy summer grass. The same source lists three jobs for it:

• It offsets seasonal swings, so a winter wheel matches a summer one.
• It hides the translucent look of lower-fat cheese.
• It signals a style. Leicester, Mimolette and Irish Red Cheddar are all named as coloured cheeses.

That second point is the cover-up in modern form. Pale, low-fat curd looks slightly glassy. Orange pigment makes it look dense.

Why America split in two

The habit crossed the Atlantic. Kindstedt says cheesemakers in Indiana, Ohio, Wisconsin and New York coloured their cheddar, for tradition, for uniformity, and to stand out on a shelf. New England went the other way. "Here in New England there was a disdain for brightly colored cheese," he told NPR. That is why Vermont cheddar is so often naturally white.

The natural effect has not gone away. Nat Bacon of Shelburne Farms in Vermont told NPR: "We absolutely see the color changes when the cows transition onto pasture in early May." Cheese from grass-fed herds can turn butter-yellow in summer, close to what Londoners were buying centuries ago.

So you can taste-test the argument. A white Vermont cheddar and an orange Wisconsin one differ in pigment, not in any measured promise of quality.

What the law says about the dye

In the United States, annatto extract is a listed colour additive. The federal rule, 21 CFR 73.30, defines it as an extract prepared from annatto seed and allows it for colouring foods generally at good manufacturing practice levels. It cannot colour foods under a federal standard of identity unless that standard allows added colour. Labels must show that the colour comes from annatto seed (21 CFR 73.30).

Read that last clause as a design brief. The industry has to tell you the colour is added. The orange itself still does the persuading before you reach the label.

What this means for your palette

Cheese is a clean case of a trap you will meet in interface work. A colour starts as a side effect of something real. People learn to read it as a signal. Then someone discovers the signal can be produced without the real thing, and the colour keeps its meaning long after it lost its basis.

Your users are trained the same way. Green means success, red means danger, and a gold badge means premium, mostly because they have seen those pairings before. Chromatic memory shows how strongly people attach expectations to a hue, and the pill colour research shows those expectations can change what people report feeling. Retailers know it too, as the piece on grocery store colour manipulation shows.

Three habits follow:

• Ask what a colour has taught your audience to expect before you use it as a status signal.
• Do not use a colour to imply a quality the product lacks. Cheese got away with it for centuries. Your users will not.
• Check your swatches against real values. The colour converter turns an annatto orange like #e8a33d into HSL or RGB so you can compare shades by number, not by eye.

The next time you see a bright orange block of cheddar, you are looking at pigment doing the work that fat once did. Whether that bothers you is a matter of taste. Knowing it is there is just good colour literacy.

Sources

• How 17th-Century Fraud Gave Rise To Bright Orange Cheese, NPR
• Why are some cheeses orange?, University of West London
• 21 CFR 73.30, Annatto extract, Legal Information Institute, Cornell Law School
• The Cheddar is to Dye For, Culture magazine