Daily Archives: February 18, 2016

A rainbow wand works by varying the pH of a solution from one end of a tube to the other. A pH indicator provides the color — An acid-base rainbow wand is an easy and colorful chemistry demonstration which illustrates the range of colors available for a pH indicator solution. Take a long glass tube and fill it with Universal Indicator solution. Add a few drops of 0.02M HCl to one end of the tube and seal […]

Rainbow Wand Chemistry Demonstration

This entry was posted on February 18, 2016 by Anne Helmenstine (updated on November 6, 2017)

Food additives may be either natural ingredients or synthetic (artificial) chemicals. They are added to nearly all foods to improve flavor, prevent caking, slow decomposition, add color, and to improve texture. (Michael Stern) — A food additive is any substance added to food to improve its appearance, stability, flavor, texture, shelf life, or other characteristic. An additive could be either a natural substance or a synthetic chemical. Here’s a comprehensive list of food additives and their uses. Alphabetical List of Food Additives and Uses […]

Food Additives List – Names and Uses

This entry was posted on February 18, 2016 by Anne Helmenstine (updated on August 29, 2018)