sc.pl.palettes.godsnot_64 18th colour invisible against white BG
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Description
Hey @fidelram !
I've noticed this quite often... the 18th colour in sc.pl.palettes.godsnot_64 is pretty much invisible against a white background. I otherwise consider this to be the best palette out there as it distinguishes cell clusters quite well. See "Progenitor Leukocyte" in the legend below.

Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at the sc.pl.palettes.godsnot_64 entry point and inspect how its colors are defined and used in plots with white backgrounds. Reproduce the palette with a legend containing at least 18 colors, then adjust the problematic color so the “Progenitor Leukocyte” entry is visible and verify the resulting plot.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100