RAL Design System plus — hue 090
Yellow is the only colour family in which lightness and saturation are tied to one another. A yellow cannot be dark and still stay yellow: bring the lightness down and the eye reads not a dark yellow but olive, khaki or brown. You see that reflected in the range. The darkest shade, 090 30 10 (Limonite brown), has an LRV of 9.2 and is called yellow by nobody; the most saturated, 090 80 90 (Contrasting yellow), sits high in lightness instead. The intense yellow of this hue lives together in the upper corner of the lightness/saturation field, and that is not a choice by its compilers but a property of the colour.
In practice this means that within 090 you do not have the same freedom of movement as in a blue or red hue. If you want to keep yellow, you stay above L\* 70. Drop below that and you are in reality choosing another colour family — usable, but something other than what you meant.
At low light levels yellow becomes unrecognisable later than most colours and has a high light reflectance value of its own. Those two properties together make it the colour of warning: RAL 1023 traffic yellow and RAL 1003 signal yellow are the best-known examples. The strongly saturated shades of this hue lie in that same area, and that has a consequence for decorative use. In a public or industrial setting a yellow with a saturation above about 70 is almost always read as a sign, even when it is meant as a colour.
All 46 colours in this group
More about hue 090
On the warm–cool scale 090 lies in the warm half, but the peak of colour warmth is at around a hue angle of 50 degrees, in the oranges; with an average angle of 92 degrees this hue is noticeably past it. So yellow is warm without the glow of orange — a brightness rather than a warmth.
What makes a yellow surface lively is almost entirely the saturation. 090 80 20 (Champagne beige) and 090 80 80 (Poster yellow) have the same lightness and the same hue; the first is a calm interior colour, the second claims the space. So anyone wanting to adjust the effect of a surface changes the last block and not the hue.
Yellow pigments cover poorly. They have little scattering power, so the substrate shows through for longer and an extra coat is needed more often than with a neutral colour. Differences in film thickness are accordingly visible in yellow straight away as a difference in colour, not only as a difference in gloss. In spray work in a saturated shade from this hue, an even build-up matters more than in any other colour family.
Light, weakly saturated yellows also yellow along with the binder. In a yellow that shift is harder to see than in a white, but when touching up years later it comes out after all: the new surface stands colder than the old. So assess and approve on the A4 colour samples as the colour standard, and when touching up, measure the existing state instead of comparing it with a sample.
Technical data
Hue: 090 · Shades: 46 · Lightness: L\* 30–93 · Saturation: C\* 05–90 · Lab values: per shade on the colour page · LRV: 9.2 to 83.1 · Included in: RAL D4 A4 colour samples (colour standard), RAL D2 fan deck, RAL D3 colour book, RAL D4 atlas, RAL D6 and D8 boxes
Neighbouring hues
RAL Design 085, RAL Design 095
Click a colour for the available formats, or see the full product range in the shop.
