Colour production trends: Fermentation
Colour is an important part of what appeals to consumers about food, making it stand out on the shelf and enhancing the perception of taste. Food colourants, therefore, have a vital job to do. Fermentation, which can produce vegan, kosher and halal colourants that can be created with low land and water use and used across a wide range of products, is one of the key methods often used for creating colours.
Source: foodnavigator.com