The palette on the glass canvas

Every Mercia colour, plus the two non-brand hues currently live on the model pages, drawn on the real gradient behind the real glass panel. Four opacities per colour: solid, then three steps of transparency down to the most transparent the marks could sensibly carry. Contrast is measured against the panel itself, so it is the number a reader actually experiences. A fill, a line and a text sample sit in each cell because the same colour passes as a bar and fails as a word.