Carbon black, also known as vegetable carbon or E153, is a food coloring additive that is commonly used in certain food products, including some sauces and mayonnaise. It is a finely powdered form of carbon derived from the incomplete combustion or pyrolysis of vegetable matter. Carbon black imparts a black color to food and can be used to achieve a visually appealing appearance in sauces and mayonnaise where a dark color is desired. It's important to note that the use of carbon black in food products is regulated and subject to safety standards to ensure it meets the necessary requirements for consumption.