#b91c1c as text	Ratio	AA	AA large	AAA	Fix
Aaon white	6.47:1	pass	pass	fail	AAA: use #ad1a1a as the text (7.14:1)
Aaon black	3.25:1	fail	pass	fail	AA: use #df2a2a as the text (4.5:1) AAA: use #ea7171 as the text (7.1:1) AA: or shift the background to #d9d9d9 (4.58:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b91c1c as the background.

Brands using this color

Datadogaccent · #bf0000 · Δ1.787

Palettes built around it

b91c1c 78716c d97706 f5f1ea 1c1917

Newsprint

Open in tool →

Ink-black on warm paper with a single red — the broadsheet hierarchy that lets typography lead.

Editorial Muted Warm

Fonts for this mood

#b91c1c reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

Warm fonts →Playful fonts →Bold fonts →

mcpConnect your agent — build around #b91c1c

live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp

claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp

try this prompt

›analyze #b91c1c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b91c1c-c4a19c-62cb98-2d251f-f1e9ed?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