My natural colour is a mid dark brown and I’ve been having my hair coloured a dark brown for over a decade. I’ve had enough of the time and commitment and want to grow out my greys (recon I’m at least 20%) but I don’t want a line. Insta tells me this ^ is a thing (using a demi permanent colour at home to help blend the greys?). Is a demi like a semi? Has anyone done this? Ive had short hair before so imagine I’ll eventually (2years?) have it all cut short (currently shoulder length). Any advice or experience welcome!