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Now, I was never very good at Chemistry at school (miraculously scraped an E in my O Level) but I can confidently say that that is an enormous test tube full of copper sulphate. When we used copper sulphate in our Chemistry lessons, it was only ever dispensed in tiny, tiny quantities. Maybe that's because I went to a comprehensive school. This lad must be reaping the benefits of a private education: enough copper sulphate to bathe in.
I don't like the way he's looking so smug about it. Nice 4-ply hand-knitted v-neck jumper, though. I can't imagine hand-knitting school uniform these days.