Bacteria Linens (white, cream, yellow or red mold) is used in making surface-ripened or interior mold-ripened cheeses such as Brick, Limburger and Muenster. It develops rapidly, ensures a good ripening, and produces flavor.

This can be added to the milk at the beginning of the process as well as used in the wash (needs re-hydrating for 8-12 hrs in light salt wash) during the ripening process for washed rind cheeses. The characteristic yellow to orange color may take 15-20 days to develop.