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I'm trying to see if such a thing exists in paper form that upon activation, changes colour or "indicates" after a set configurable amount of time.

In other words a litmus or pH paper that can act as an egg timer. I'm by no means a chemist so please excuse my lack of protocol.

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I'm not aware of any commercially available examples, but I know that the speed of a fluid wicking through a paper microfluidic device has been used for timing. I'm also reminded of pencil detonators, dating back to WWII, where the time taken to dissolve a lead wire is used for timing. Since electronic timing is now so cheap, easy, accurate, and reliable, I'm not surprised that chemical timers have pretty much died out. There are a number of chemical phenomena that could be exploited for timing, but unless you need a huge number of cheap, one time use timers with relatively poor accuracy, there are probably better choices.

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