Copper chlorophyll extract, also known as copper chlorophyllin, is a derivative of chlorophyll in which copper is substituted for magnesium. It is used as a food colorant in some applications, including sauces and mayonnaise. Copper chlorophyll extract provides a green color to the condiments, similar to regular chlorophyll extract. However, the addition of copper may alter the stability and properties of the extract. It's important for manufacturers to follow safety regulations and guidelines regarding the use of copper chlorophyll extract to ensure its suitability for consumption in sauces and mayonnaise.