*Below I’ve listed the key chemicals found in a common household product. I’ve drawn the chemical structures of principal components where simple and appropriate; given the E number or CAS number (however tempting Sigma-Aldrich catalogue numbers would be) if no simple chemical structure exists for an additive; and given the chemical formulae or name if neither of the above make sense. See if you can guess what this is! If no one gets it within 24 hours, I will post a clue.*

## 13.31 g Cu, 4.44 g Ni

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*Related*

Denim?

Yes, but a little more than just denim!

It’s a pair of jeans isn’t it? Thought so.

Ah but it’s more than a pair of jeans. A specific part of the jeans and then something else…

Guessing the metals indicate the zipper or something similar?

Just stumbled across this, my PhD viva taught me that the last molecule is indigo, which would I assume be the dye for a pair of jeans.

Yep, definitely part of a pair of jeans. The metal is not the zipper or studs though – something else…

65p.

If you want to be precise, 65p in the minimum number of newly-minted british coins in general circulation as of 2011, namely a 5p, a 10p, and a 50p. The total mass is 17.75g, and the mass ratio is 75:25 copper:nickel (within 0.5%) which limits it to the British new 5, 10, 20, and 50p coins. The rest is just packing coins into that ratio (and there must be an odd number of 5p coins, or leave a 50mg remainder).

Also, because the 5p is exactly half the weight of the 10p, it could be made up as 5 + 5 + 5 + 50, but that isn’t elegant enough to be the right answer.