# W3C: Understanding Success Criterion 1.4.1 Use of Color

> Primary web-accessibility guidance. The physical-marker reading check is an explicitly editorial application, not a physical-label compliance claim.

Canonical page: https://datacenterlabeling.com/references/s47

Original source: [W3C: Understanding Success Criterion 1.4.1 Use of Color](https://www.w3.org/WAI/WCAG22/Understanding/use-of-color.html)

## Scope of this source

Primary web-accessibility guidance. The physical-marker reading check is an explicitly editorial application, not a physical-label compliance claim.



Rackstamp provides editorial field guidance. IDs, cases, and worksheet entries are fictional examples unless identified otherwise. Distinguish local conventions from adopted standards. Source notes describe the evidence scope; a linked overview is not the full standard or a project approval.

## Related guidance

- [Create a cable-color legend people can use](https://datacenterlabeling.com/guides/cable-color-legends)