How soon can i dye my hair after chemo?

I had breast cancer twice first time I had 37 radiation treatments in 2007 2016 it came back and I underwent chemo treatments I finished my chemo in February and my hair was naturally blonde and now it has come back gray and brown I want to dye it I have ordered some chemical-free die so I hope it dies it back blonde my hair’s always been blonde since I was a little girl but as long as I am a survivor I’m happy my breast cancer won’t come back I had a double mastectomy boy do I miss my breath though but hopefully they can do reconstructive surgery soon but I don’t know the doctor said I wasn’t a good candidate for it because when I had radiation on my left side it messed up the skin inside my skin was falling apart inside as the doctor was taking out my breast what was left of it but I pray everyday that I will get them back might not be as big as they were but anything will do but we are survivors you take care God bless you