Well, I'm that kind of kid
, and it definitly doesn't explode if it isn't mixed up with air/oxygen.
But with your method it is.
For saving power and getting it faster you kan youse a 25% KOH dilution.
But, it is very dark, so you won't get anything but a dark pic. (flashing is no use either.
And if you fill the balloon too much it explodes.
(If you want it to explode use 1:2 ratio.)