How are we one-hundred percent sure that testing the Earth's age is being done? 😌?

I've heard people say carbon dating or whatever but what I'm asking is, how are we sure this is actually telling us an age and it's not just a reaction? Is it like just some kind of acid bring used or something? What is it that makes completely sure a date to an object is being confirmed? What accurate... show more I've heard people say carbon dating or whatever but what I'm asking is, how are we sure this is actually telling us an age and it's not just a reaction? Is it like just some kind of acid bring used or something? What is it that makes completely sure a date to an object is being confirmed? What accurate info is being shown?
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