Besides being used as a 'salt substitute', adding about 1 teaspoon of white vinegar while cooking white rice makes it fluffy and extra white.
 
 
 

White Rice

Carolina® is the North-East favorite long grain rice. For over 89 years, Riviana Foods Inc. has been packaging and marketing rice for the U.S. consumer. Known for its consistent high quality, Carolina rice is the preferred brand among many families. Carolina rice is available in a variety of sizes from 1lb. to 20lb. It's easy to prepare, economical, versatile, and a healthy complement to any meal. Carolina rice is grown in the U.S.A. and is Kosher approved. Families can trust Carolina to cook into fluffy white rice. Carolina Rice is naturally sodium free, cholesterol free, and fat free.