On the positive side, hair loss would mean no need to colour the hair.
Yeah it’s gotten a lot of bad press recently, I got a chem burn off the beard dye, luckily it healed but have a quick google, this popped up for me: https://www.consumeraffairs.com/cosmetics/just_for_men.html
Is that true? I've had grey hairs appearing since 18 and left nature to it. I like the idea of the shampoo that slowly colours though. Expensive though. Edit : Just realised it may read like I am doubting you. More curious with your experience than anything else.
Cold, it’s been £4.99 in home bargains since forever
Not as much as the bleach that I used in the 1980’s.