---
title: "Get Physics"
method: GET
path: "/physics/{hex_val}"
---

# Get Physics

`GET /physics/{hex_val}`

## Request

- Base URL: `https://api.colourmemory.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.colourmemory.com/physics/{hex_val}`
- Auth: none declared

Display-colour metrics for any hex value (the colour_metrics tool).

Returns:
- LRV estimate from luminance (CIE Y x 100) and band -- not a measured LRV
- Relative luminance and CIELAB L*, a*, b*, chroma, hue angle (D65)
- Bradford corresponding colours under CIE A (2856K) and F11 (4000K)
- not_derivable: what a hex cannot support (thermal / solar performance,
  finish effects, measured LRV), with reasons
- Pigment: always unknown -- not identifiable from a hex

Derived from the display colour, not measured; methodology in the response.

Example:
    GET /physics/1B1556
    GET /physics/CC1A14?zone=Red

## Path parameters

- `hex_val` string, required

## Query parameters

- `zone` string

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/colourmemory/apis/colour-memory-api.md) · [All operations](https://skmtc.dev/colourmemory/apis/colour-memory-api/llms.txt) · [OpenAPI document](https://skmtc.dev/colourmemory/apis/colour-memory-api/revisions/4ba028f64042?raw)