I am am making a steampunk styled gas gun, with a fuel tank backpack, see here
. My questions are about materials.
I am wanting the central cylinder to be a clear plastic filled with colored liquid of some sort. What can I use for a cheap, easily available clear plastic tube or cylindrical container about 10-12 inches in diameter & 10-18 inches tall (or easily cut-able) for the base of the "fuel tank"? It needs to be rigid enough that I can wear it as a backpack, but something I can drill holes into for supports.
Secondly, what liquid should I use for the "fuel"? With plain water I am concerned about mildew (ideally this would be permanently sealed) and adding soap or bleach would make it sudsy. The liquid would need to be able to be colored, so...food coloring? Ink? What would work best without dying the plastic?
Thanks for any sugestions! n_n