wisconsincheese.com, Tiny Fox Lab

Not all cheese melts as graciously as Monterey Jack.

The creators of smooth processed cheeses like Velveeta or American cheese have a solution: a salt solution.

Sodium citrate is the best known of a few different ingredients known as melting salts, which facilitate the melting of old or stubborn cheeses. It’s a white powder with a salty-sour taste, but in cheese, its taste isn’t noticeable.Tiny Fox Lab

Preview photo credit: wisconsincheese.com
Source: https://www.cooksillustrated.com/science/830-articles/story/cooks-science-explains-sodium-citrate