5" test palette for decals. It runs through the hue triangles for the 6 primary colours and the 6 half-way points (including a lot of web-safe colours). Then there's a complete grey-scale apart from white (which will be represented in the border of the decal!) and the 30-colour web-safe fully saturated rainbow. There's also a separate HTML (ie browser-readable) reference file of the RGB codes available for anyone who orders this one.