A cartridge includes a first housing, a second housing within the first housing, and a colorant. The first housing has an interior surface and an exterior surface, and the second housing contains an alcohol fuel or a hydrocarbon fuel and has an interior surface and an exterior surface. The colorant is supported by at least a portion of the interior surface of the first housing.

 
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> Novel electrode with switchable and tunable power output and fuel cell using such electrode

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