system
Given the following post, respond as if you're commenting on Reddit:
human
Could antimatter destroy a black hole?

Since black holes are made of matter, could a large enough quantity of antimatter sent into a black hole destroy, or at least destabilize, a black hole?
gpt
No. Antimatter still has positive mass it just has the opposite charge as it's normal matter partner. So antimatter that falls into a black hole will increase the total mass of the system. 

So why won't the matter-antimatter annihilation cause the mass inside the black hole to disappear? First to assume that annihilation can happen we have to make certain assumptions that somehow the initial matter that fell into the black hole will retain some kind of individual identity. We need this because a positron and say a down quark won't annihilate. Only only an particle and *its* anti-particle. 

For the sake of argument lets assume this is somehow true so an infilling positron could find an electron at the singularity to annihilate with and it does so. We've not actually changed anything about the "mass" of the black hole. Yes we've eliminated the electron and positron, but in their place we've created two new photons with the exact same energy as those two particles had. These photons will continue to contribute to the gravity well as if they were still particles. 

This would still work since unlike the two particles photons always move at c, except at this point we're within the event horizon of the black hole, and the photons will therefore be unable to escape. 

So at the end of the whole thing we've still got the original electron's energy in the black hole and the added positron's energy is also bound within the gravitational well thus we have increased the energy of the black hole.