ROYGBIV, and where every Fiesta color actually falls

Each glaze below is placed by the hue of its hex value, using the conventional band boundaries printed with each section. Colors carrying almost no hue - the whites, grays and blacks - are listed separately at the end, because putting them on a rainbow would be arbitrary.

Two caveats worth stating. Newton's seven bands are a convention, not a natural division: indigo occupies barely twenty degrees, and he arguably added it to make the count match the notes of a scale. And the meanings below are conventions of design and marketing, which are observable, rather than claims about what colors do to your nervous system, which are not well supported.

One more, and it is the honest one. A hue angle is precise, but precision is not the same thing as being right. Pale colors are the worst offenders: wash enough color out of something and people stop naming it by wavelength and start naming it by family. Where the number and my eye genuinely disagree I have said so on the swatch and given the reason, with the measurement printed alongside so you can take the other side. Anyone who has argued with their spouse about whether a shirt is mustard or dark gold already knows how this goes.

Red is the conventional signal for urgency and appetite. Clearance signage, sale banners and fast-food branding lean on it because it is the hardest color to overlook, and because food photography has trained us to read warm reds as ripe. Whether it genuinely raises your pulse is contested; that designers and marketers use it this way is not.

Brands that lean on it: Target, Coca-Cola, Netflix, McDonald’s
On a table: On a table it does the same job: a red plate reads as occasion before you have put anything on it.

Orange carries red's warmth without its urgency, which is why it is the standard choice for a call to action that wants to feel friendly rather than pressing. It reads as approachable and inexpensive, and it is unusually common in brands that want energy without aggression.

Brands that lean on it: Nickelodeon, Fanta, Home Depot, Amazon’s arrow
On a table: It is the most reliably cheerful band in the Fiesta palette, and the one that most obviously says "not a formal dinner".

Yellow is the lightest of the saturated hues - at full chroma it reflects more light than any other - which is why warning signage and taxis use it and why it catches the eye first on a shelf. The same brightness makes it tiring in quantity, so it tends to be used as an accent rather than a ground.

Brands that lean on it: IKEA, Best Buy, Ferrari, Snapchat
On a table: A yellow charger lifts a dim winter table and can flatten a delicate one.

Human vision peaks in sensitivity right in the middle of the green band, around 555 nanometres, which is a measurable fact rather than a slogan - we simply see more gradations of green than of anything else. Brands use it for growth, health and money, and it is the default for anything claiming to be natural or sustainable.

Brands that lean on it: Starbucks, Whole Foods, Animal Planet, John Deere
On a table: It is Fiesta's largest family, and the hue that sits most comfortably next to both warm and cool colors.

Blue is the most widely preferred color in cross-cultural surveys, and the default for any brand selling trust - finance, healthcare and technology are saturated with it. It is also almost absent from natural food, which is why it is rare in food packaging and why it makes such a clean ground for a plate.

Brands that lean on it: PayPal, Meta, Ford, American Express
On a table: Whatever you serve reads as separate from the plate underneath it, which no other common hue does as reliably.

Indigo is the contested one. Newton added it to make the count seven, matching the notes of a musical scale, and most people cannot reliably separate it from blue or violet - it occupies barely twenty degrees of hue. Where brands use it deliberately it reads as blue's seriousness with something more premium and less corporate behind it.

Brands that lean on it: Samsung, IBM, HP
On a table: Fiesta has made very few glazes that land here, which is part of why the ones that do feel unusual.

Violet's association with luxury is not a marketing invention. Tyrian purple was ruinously expensive in the ancient world - thousands of sea snails for a single garment - and the color carried that cost as status for centuries. Modern brands inherit the association and use it for premium, creative or indulgent positioning.

Brands that lean on it: Hallmark, Cadbury, FedEx’s "Ex", Twitch
On a table: It still reads as deliberate rather than casual, which is why Fiesta waited until 1993 to make one.

These carry so little chroma that their hue angle is meaningless - a measurement of almost nothing. They are the grounds the rest of the palette sits on, and Fiesta has always kept at least one in production.