Colouring regrowth of hair after chemo

I finished Chemo Mid August this year. I had a large amount of regrowth on my hair roots ( I kept most of my hair, by using the Cold Cap successfully). I was both eager and nervous to have a colour. I had pampered my hair through Chemo. But I couldn't resist having my colour done, only 2 weeks after Chemo. The hairdresser said it was a tint and didn't contain peroxide. My hair did not fall out , which I was mildly worried could happen.