[tntdynamite]

I was dying my mom's hair with one of those do it yourself kits. And on the instructions it said to be careful if you have a tattoo. I asked my mom what it meant by that, I thought it was pretty stupid being how far apart tattoos and hair dying is. She said that if you get a tattoo first, your body isn't used to the dye in there, and when you put dye in again, it recognizes it and might have a reaction. So I was wondering, if it recognizes a hair dye, what would happen if you get another tattoo? I know people have more than one, but are there some cases where they have bad reactions? Or just like a rash or something?