Phosphonate salts are the result of deprotonation of phosphonic acids, which are diprotic acids: Phosphonate esters are the result of condensation of phosphonic acids with alcohols. Several methods exist for the preparation of phosphonic acids and their salts.
1 Stir in the tomato sauce, tomato paste, vinegar, diced tomatoes, and brown sugar. Season with chili powder, Italian seasoning, and salt. Bring to a boil, reduce heat to low, and simmer 1 hour.  Mix the cornstarch and water, and stir into the salsa to thicken. Transfer salsa to sterilized jars, leaving 1/2 inch headroom, and seal. Process jars in a boiling water bath 15 minutes. Store unsealed jars in the refrigerator.
Tips: Before you add a thickener to a sauce, skim the fat from the top. Once you've added the thickener, the fat will be harder to remove. Flour is a good thickener for gravies, gumbos, and stews, since it gives them a smooth, velvety texture.It's best to mix it with fat first, either by making a roux or beurre mani, or by flouring and frying stew meat before adding a liquid to the pot. good way to thicken soups or stews is to add grated starchy vegetables, or to pur e the vegetables in the sauce. Nuts make good, flavorful thickeners for stews, though they're often expensive and high in fat. Just grind them down to a flour or butter, and add them to the dish.