Can the colours of a colour font be changed?

Hi, I was wondering if it’s possible for users to change the colours of a colour font after download/installation. For example, if a font is initially made of two colours, can these be personalised after creation?
Thanks !

There is some support for this in the color font spec but it is not implemented in any app, yet.

You can change the colours Of a generated font with fonttools bzw. ttx
The colour values can be changed in the respecting tables and once inserted back into the font you should see the change.