I remember being young and thinking middle-aged people are staring at me because they want me /they disapprove/whatever.

Now I'm middle aged myself, I know the staring is way more likely to either be something along the lines of "ah that kid is so 90s, I never had that green colour but blue Fudge used to wash out to green like that..."

Or "have we run out of natural yoghurt, we bought that 500ml pottle last week but we had curry twice, maybe I should get some more..."

“OK so she must’ve bleached the full head then done the green side first, then the black side. Man her scalp must be itchy as fuck. What did I used to use to stop the burn? Coconut oil? Yeah that’s right. Smelt like Malibu for a week or so, and had to throw out that set of pillow cases. Man that sucks, I loved those pillow cases, perfect for winter. I wonder if you can still get them?”

Morpheus: ".... and find out just how deep the rabbit hole goes." Only it's more like an interconnected maze of rabbit holes leading everywhere. I wonder if you can still get "pina colada" Malibu?

Theoretically she could part her hair with a knife and bleach the green side, wait 20 min and put the black side on with a toothbrush, then wash it and add the green as required?

I love how Gen Z has gone back to all that stuff.

With a knife?? Why not a comb???

There's probably fancy metal hairdressing combs that would do it, but the "prow" of a normal comb is too blunt to separate the hair perfectly. You end up with strands from the left on the right etc.

The old DIY trick is to turn a sharp-pointed knife upside down so that the blade doesn't face the scalp, and then use the point to gently part the hair. That's how you get a perfect straight parting.

Okay, that’s a relief. I thought you were meaning to actually use a butterknife. I’ve only seen it done with rat tail combs so I was worried.