I'm not sure you can paint velvet. You could probably dye it a darker color. You may want to look into having the chair re-upholstered
Hi Dolores, yes, you can. Here's one example, hope it helps! https://www.hometalk.com/5930253/painting-velvet-with-chalk-paint-say-what
I found this, it looks like it is possible: https://themagicbrushinc.com/paintingvelvet/
Maybe get a cover for it .