Where is the liquid indicator in iphone 4s?

I dropped my iphone in sea water just for seconds and i have looked carefully inside the aux jac port and it hasn't gone red, i've also looked at the bottom and its not red, i was wondering where is the sensor to know weather it has triggered or weather i was lucky enough

I have taken one apart before and there's one inside, but i honestly forgot where it was, go to youtube and type iphone4 dissasemble, it will tell you there

There are 3, one in the headphone jack, 1 in the charger port, i inside.
the turn a light pink, not red.

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