Is there a maximum of colors per palette for CPAL/COLR?

Is there a maximum (recommended) of colors per palette for CPAL/COLR?
I would also like to know if more colors will increase considerably the size of the font or not.
I’m thinking of doing a font with 4 palettes, each with 256 colors…

Yes, this is possible. CPAL can store up to 65 535 colors and 65 535 palettes. Adding more colors has little impact on the font file size.

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