Gemstone
Open in tool →Emerald, amethyst and ruby on velvet-black — the jewel-tone trio; the surface must be dark or the stones go plastic.
Color
#100519
#100519
hex
#100519rgb
rgb(16, 5, 25)hsl
hsl(273, 67%, 6%)oklch
oklch(0.148 0.046 308.2)Closest name: Crow (#180614)Relative luminance 0.0029
Colors that go with #100519
Charcoal, Dark Olive Green and Sea Green lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #100519: softer than #000 and cool enough to feel like part of the same palette.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #100519 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #100519: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
triadicshippedSienna completes a triad with #100519 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Slate Blue #6a5acd
analogousshippedSlate Blue is #100519's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
triadicshippedTeal completes a triad with #100519 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #100519 in 16 real palettes, including Southwest Airlines's brand system and Lemon Squeezy's brand system, as the accent.
Blue #0000ff
shipped18 real palettes, including Pfizer's brand system and native Cybersecurity's brand system put Blue beside #100519, as the supporting colour.
Real palettes that use #100519
Tints & shades
Harmonies
Contrast
| #100519 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 19.85:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.06:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #100519 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#100519 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #100519
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #100519 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/100519-b79cc4-c4cb62-2d1f2d-eae9f1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md