KMnO4 and glycerin is used by campers to start fires. I don't know how KMnO4 would do sitting on top of TATP. Hmmm, manganese ion and unstable peroxides? (The purple decomposes perox like you wouldn't believe. Used I think in some rockets, though catalytic silver pads don't get used up (over the lifespan of the gas generator or rocket)) Anyway maybe you could have a separator if you thought there a reason to use that mix to start your detroit-petn-condom crotchbomber stack.

(Of course, this will be a female cavity bomb next...)

The IRA used condoms as a time delay element to keep sulphuric from mixing with chlorate and sugar. It was awkward as the IRA is catholic so condoms for their normal use are not cool. But they're awesome consistant for making delays, no doubt.