Originally Posted by discontinuuity
You can remove zinc by soaking it in acid. I've had pretty good success using plain vinegar, but if you want to be real fancy you could sort of reverse-electroplate it.
As a kid I used to take a box of my dads old galvanized nails and put them in a metal bucket and pour muratic acid on it. The reaction produces much hydrogen and I would light the bucket. Whala, instant hydrogen torch!