This is a salt called sodium acetate. And it's actually a highly concentrated form of the salt. This is a hydrated salt where we have dissolved in its own water. And so it is at its solubility limits. And we're going to add a little bit of solid salt in what you're seeing. This is videos what's going to be occurring right here. The salt will precipitate out of solution. So there we are on camera. And you can see a solid appearing. We say that's precipitation, not like the ordinary citizen says, oh, it's precipitating. Not that I ever say that. We think of rain precipitation. But to a chemist, it's the appearance of a solid in solution. If we were taking the temperature of this, they would be heat released. It takes heat to dissolve these salts. And when they come out of solution, they release that energy.