What happens to a Batarang after it's used?

Revisited posted...

Well that ain't fair, no one asks what happens to a spider web after Spiderman is done with it, why is batman being singled out

I actually did wonder this and why his webs didn't litter the streets, but yeah, they dissolve :<

https://www.youtube.com/watch?v=P2Q8-NQ38CA

Also a clip just minutes later that shouldn't be funny but...

https://www.youtube.com/watch?v=uRV6L1C_RNU