# Undefined control sequence \\textcolor

**URL:** https://meta.discourse.org/t/undefined-control-sequence-textcolor/372840
**Category:** Bug
**Tags:** math
**Created:** [July 3, 2025, 9:08pm UTC](https://meta.discourse.org/t/undefined-control-sequence-textcolor/372840 "2025-07-03T21:08:27Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![Ethsim2](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/ethsim2/32/522255_2.png) [@Ethsim2](https://meta.discourse.org/u/Ethsim2)
#### Post date: [May 31, 2026, 7:58am UTC](https://meta.discourse.org/t/undefined-control-sequence-textcolor/372840/3 "2026-05-31T07:58:54Z")

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You’re right. It does seem to have gone away after

> [@Upgrading Mathjax to version 4](https://meta.discourse.org/t/upgrading-mathjax-to-version-4/392669):
>
> @sam and all interested in typing math in Discourse. I’ve updated the discourse-math plugin so that it uses MathJax V3, rather than the much slower and very outdated V2. As expected, the result is a much snappier user experience, while still maintaining the feature rich environment as compared to KaTeX. I’d love to issue a pull request, if you think the results look good. You can see it in action on my class Discourse site: Most of the content on that site is private or unlisted. There sho…

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