Shallow Question

Has anyone ever dyed their hair while on chemo? My roots are getting bad and I was thinking of just combing some dye through my hair and trying not to keep it on my scalp too much. I don't know if it will work, but I don't like going to the beauty shop and them putting the dye on my scalp for 45 minutes under a heat lamp. Any ideas? God Bless You All- Cathy