This is the hair dye I use.

I need to dye my gray roots regularly, but going to a hair salon is a hassle for various reasons. It costs a lot, and I feel like the time spent just sitting there is a waste. So, I just buy hair dye from online stores and do the root dyeing myself. I started using this one a while ago, and it’s convenient because the volume is divided into just the right amount for root dyeing. My scalp doesn't itch either... hehe.