[NellKidd (OP)]

I want to make the chemiluminescence reaction you see within glowsticks, and all the methods I see online use 30% hydrogen peroxide. In the UK we can only buy max 12% hydrogen peroxide without a licence, so I was wondering if the reaction would still work?
Or would the luminescence just be quite weak?

[evan_au]

Hydrogen peroxide is a good oxidiser.

Reducing from 30% to 12% hydrogen peroxide means that the reaction will be a bit slower, and it will stop sooner.

To minimize wasted ingredients, reduce the quantity of the other reactants by the same ratio.

[Bored chemist]

Or... use 30/12 times as much peroxide solution.
It will still be slightly less bright, but I doubt many people will notice.