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Sodium citrate is a common food additive used to delay gelling by tying up calcium ions in a liquid and improving the quality and stability of the food products. It is only effective at high pH levels.
Sodium citrate is the ingredient in Velveeta cheese that makes it melt so well. You can make your own super-melty cheese sauces with the addition of sodium citrate. It's very easy to use. Just whisk it into a liquid then whisk or blend in the cheese and voila, smooth cheese sauce!
These cheese sauces can be cooled and reheated, molded and cut for cheese slices, used as fondues and quesos or added to macaroni and cheese. The thickness of the sauce will depend on the ratio of liquid to cheese.
You can read more information about sodium citrate from my how to use sodium alginate guide or any of the sodium alginate articles and recipes below.