Color

#b12910

#b12910
hex#b12910
rgbrgb(177, 41, 16)
hslhsl(9, 83%, 38%)
oklchoklch(0.499 0.176 32.4)
Closest name: firebrick (#b22222)Relative luminance 0.1097

Colors that go with #b12910

Royal Blue, Steel Blue and Teal 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.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#1099b1

#b11049 · #b17910

#10b129 · #2910b1

Split-complementary

Open in tool →

#10b179 · #1049b1

#49b110 · #1099b1 · #7910b1

Contrast

#b12910 as textRatioAAAA largeAAAFix
Aaon white
6.57:1passpassfail
  • AAA: use #a82610 as the text (7.12:1)
Aaon black
3.19:1failpassfail
  • AA: use #e03315 as the text (4.65:1)
  • AAA: use #ef6e57 as the text (7.04:1)
  • AA: or shift the background to #d6d6d6 (4.52:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b12910 as the background.

Brands using this color

Fonts for this mood

#b12910 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #b12910
live endpoint

Point 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.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #b12910 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b12910-c4a79c-62cba8-2d271f-f1e9ec?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md