This is a freeze-dried mixed blend culture containing Penicillium Camemberti and Aromatic Mesophilic. Penicillium Camemberti (ZX27) (also known as Penicillium candidum or Penicillium caseiolum) is essential in the ripening process of white surface mould cheeses such as Camembert and Brie and Aromatic Mesophilic (YV32) is essential in creating the creaminess and buttery flavour in the cheese. Strains included in this culture are; Penicillum candidum, Lactococcus lactis subsp. cremoris, Lactococcus lactis subsp. lactis, Lactococcus lactis subsp. lactis biovar diacetylactis, Leuconostoc Each sachet contains enough culture for 4 L of milk. Contains: milk/dairy The White Mould Culture Blend lasts out of the freezer (at room temperature) for 2 months so will be fine during postage. However, we suggest storing them in the freezer as soon as you get them in order to prolong their life.