In oups.com,
NYArtist m typed:
replying to NYArtist, NYArtist wrote:
What would I use if I decide to dye it?

If you are interested in trying concrete dye or concrete stain, you can do a
Google search for concrete dye or for concrete stain. You'll find lots of
information and YouTube videos etc.

But, my guess is that none of these will work to solve your situation.

Good luck.