Sounds like you're having fun playing with hydrogen Steven ;D, you wont see a flame as hydrogen burns clear, this is one of the dangers of a hydrogen flame, you can't see it but you know it's there when it burns you

. Hydrogen ignites violently although it is difficult to ignite as it is leaving the solution because hydrogen dissipates into the atmosphere very rapidly, this is one of the upside to hydrogen in respect to leakage.(there is a lot more hydrogen being produced then you may realise) If you want to ignite hydrogen with some pops and bangs and flashes at night I will give you one of my recipes 8).
For the electrodes use stainless steel, steal a couple of knives forks etc, from the kitchen. Do not sealed the container leave it open. Users sulphuric acid/battery acid as the catalyst, you'll have to experiment a bit to find a balance between, the electrodes spacing, the amount of catalyst and the amount of current voltage that you can supply. Purified water is best and don't let any other materials into the solution except for stainless steel, this way the solution will stay relatively clean. Once you have a good reaction happening with a steady flow of hydrogen and oxygen, add some dishwashing liquid the tiniest bit at a time, this will form Bubbles of hydrogen and oxygen that you can ignite with a flame, be sure to shield yourself from the solution when you do this, as acid may splash on you from the Bubbles as they ignite.
I use 12V and around 6A, it worked really well very loud bangs

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