#9999AAMachinery (#9999AA) is a grey neutral with an OKLCH hue of 286°, lightness 0.69 and chroma 0.025. In practice it behaves as a mid-weight working color for secondary surfaces and editorial blocks.
| HEX | #9999AA |
|---|---|
| RGB | rgb(153, 153, 170) |
| HSL | hsl(240, 9%, 63%) |
| HSV | hsv(240, 10%, 67%) |
| CMYK | cmyk(10%, 10%, 0%, 33%) |
| CIE Lab | lab(63.7 3.4 -8.8) |
| OKLCH | oklch(0.688 0.025 286) |
Under warm 2700K interior light Machinery shifts subtly: takes on a magenta cast; in north-facing or shaded light it shifts subtly: takes on a blue cast. Overall drift across common illuminants is small (max ΔE ≈ 1.8), so it is a lighting-stable choice.
#a0959f — ΔE 1.8, shifts subtly: takes on a magenta cast#9f9aa7 — ΔE 1.0, shifts only faintly, with no single dominant change#9999aa — ΔE 0.0, is virtually unchanged#999aac — ΔE 0.3, shifts subtly: takes on a blue castTest Machinery in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 2.8:1 and against black 7.49:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid white text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#f0f0fe · #c7c8d7 · #9999aa · #7b7b8a · #585865 · #373742
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#a7c3e6 · #9dacd9 · #9999aa · #907fac · #876b90 · #7b5974
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#cbb1c3 · #9999aa · #7978a2 · #7c4f6f · #424063 · #382332
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#cac88f · #9999aa · #787887 · #585771 · #3b3a50 · #20202d
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f2f2ea · #9999aa · #7f7f89 · #4d4d48 · #1e1e27 · #010100
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#f1f1f8 · #c8c8d0 · #9999aa · #21212c · #030309 · #d1c94e
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#f3f3e2 · #9999aa · #848258 · #524f18 · #232000 · #010007
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#f3f3e2 · #9999aa · #957b57 · #3a562b · #2d1b00 · #000200
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffeee6 · #9999aa · #9f7562 · #195a43 · #002719 · #0c0100
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffeded · #9999aa · #a17174 · #524f18 · #002526 · #040300
#A8A8B7 · #B7B7C4 · #C6C6D1 · #D5D5DF · #E5E5EC
#7D7D8C · #626270 · #494954 · #31313B · #1A1A22
Its moderate chroma lets it work in mid-size areas — upholstery, secondary UI surfaces, editorial blocks — without overwhelming neighbors. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.