Every colour anchored to a named person, a documented year, and a consequence.
Al-Qazwini chose this yellow-green for the margins of his 13th-century cosmography — not gold (paradise) nor blue (the divine vault), but this: the shoreline of the knowable. The Byzantine archive recorded the same colour at their map's edge. Their word for it translated as "where God stops answering."
Ask the archive what colour grief is. It pulls every culture's answer simultaneously. None of them agree. That disagreement is the intelligence.
Try it liveScroll to explore the archive
"Colour signals authority only for as long as the institution enforcing it remains intact.
The moment the institution collapses, the colour becomes a historical record of a threat that no longer exists."
The archive / Query: what colour signals legitimate authority?
REST endpoints and MCP server at /mcp. Returns hex, Lab, LRV, gamut flags, WCAG ratios, cultural restrictions, pigment chemistry, and cross-archive resonance connections. Compatible with any MCP agent.
Read the docs →The /mix endpoint checks pigment compatibility against documented warnings from Cennini (1390), Tingry (1830), Field (1835), and Church (1890). Send two pigments and a medium. Receive the actual guild warning.
Pigment compatibility →Before a colour goes to market, know its history across every archive. Halal disqualification, imperial prohibition, Islamic geometric tradition, indigenous pigment sovereignty. The archive knows.
Cultural intelligence →/match a hex or name. /specify a room. /mix two pigments and a medium — and receive the historical incompatibility warning.
{
"compatible": false,
"warning": {
"source": "Cennini, c.1390",
"text": "mortal enemies
in everything",
"medium": "oil",
"effect": "accelerated
darkening"
},
"pigments": [
{ "name": "Verdigris",
"archive": "PigmentHistorical" },
{ "name": "White Lead",
"archive": "PigmentHistorical" }
],
"resonance": 232394
}
Trial calls are free and instant. Studio from £29/month. A colour consultant charges £300 for an afternoon. The API answers in milliseconds.
Founding rates close at Q3 launch.