You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
rgbcolor was reported malicious
OSV:MAL-2024-5941 - Malicious code in rgbcolor (PyPI)

rgbcolor
0.1.6

This version was deleted from PyPI around 2023-11-21. Installing fails with:
$ pip3 install rgbcolor==0.1.6 ERROR: Could not find a version that satisfies the requirement rgbcolor==0.1.6
View other deleted versions of rgbcolor

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-11-20/ \ rgbcolor==0.1.6
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Or, download files manually

And install manually via pip:
rgbcolor-0.1.6.tar.gz (1.1KB)