amazon link below. https://www.amazon.com/Carbon-Dye-100ml-Improves-permanent/dp/B07P7MD76V do your research however.
I have heard of some providers doing some sort of dyeing to make the hair roots absorb pigment, followed by laser. Don't know if its effective though.
https://www.amazon.com/Carbon-Dye-100ml-Improves-permanent/dp/B07P7MD76V