The colour card
Three oxides. Eleven colours. One rule.
Every colourway we fire is a measured mix of the same three metal oxides over the frit white — and it is mixed by subtraction, not addition, which is why it behaves the way it does.
Iron
gives red
Cobalt
gives blue
Copper
gives green
How the range is made
Eleven colours, three oxides, one rule.
Enamel takes its colour from metal oxides fired into the glass — iron for red, cobalt for blue, copper for green. Pigment mixes by subtraction: the reflectances multiply, so stacking oxides only ever removes light. That is why the middle of the card is mud, and why the frit with nothing in it is white.
Scroll to mix the pots.
The full card
Two of the eleven are references, not products. Frit is the bare base with no oxide, so it is white. Ash is all three oxides at once — the mud every mix leans toward if you are not careful.
Why the screen lies
A screen adds light; a glaze removes it. Mix two oxides on a monitor and you get a bright average — mix them in the kiln and the reflectances multiply, so complementary oxides cancel to grey. Here is the same mix both ways, measured as chroma (C*, higher is more colourful):
| Colourway | Subtractive · fired | Additive · screen | |
|---|---|---|---|
| Damson | 21 | 45 | oxides fight → mud |
| Peacock | 24 | 24 | neighbours agree |
| Moss | 9 | 26 | oxides fight → mud |
| Ash | 9 | 21 | oxides fight → mud |
Computed from the mixing model this page's canvas runs; the eleven card values are guarded against drift by scripts/card.mjs --check.