Bloomy rind
How bloomy rind cheese develops — Penicillium candidum ripening Brie and Camembert from the outside in — and how to store, serve, and care for it at home, including whether the rind is safe to eat.
Technical description
Cheeses inoculated with Penicillium candidum (sometimes also Geotrichum candidum) develop a velvety white mold rind. The mold consumes lactic acid, raising surface pH, which allows proteolysis to soften the paste from the outside in. Aging is typically 3-6 weeks; finished cheeses range from chalky-cored when young to fully liquefied when ripe. Curd is barely cut and not pressed, preserving moisture for the slow surface-driven transformation.
Aging parameters
Microbial environment
Penicillium candidum (white mold rind), often co-inoculated with Geotrichum candidum (yeasty companion mold). Sometimes Brevibacterium linens contributes faint orange tints. The dominant lactic starter is mesophilic.
Caring for bloomy rind cheese at home
Bloomy rinds are alive, and they keep ripening after you buy them — so care is mostly about pacing that ripening. Keep the cheese refrigerated, in the least-cold part of the fridge, and wrap it in cheese paper or greaseproof/waxed paper rather than plastic film. Plastic sticks to the surface and seals it; the rind is a living mould that needs to breathe. Re-wrap in fresh paper after each use.
A young cheese is firm and chalky at the core and softens progressively from the rind inward as it ripens; it is at its best once the paste has yielded evenly, and it is worth letting it lose its fridge chill before serving, since cold mutes both aroma and texture. The white coat is the Penicillium candidum mould that ripens the cheese, and it is eaten along with the paste.
Two signals are worth knowing. Surface-ripening organisms convert amino acids into ammonia, which is alkaline and drives the rising surface pH that softens the cheese — so a faint ammoniacal note is part of the process, but a sharp one that does not blow off after unwrapping means ripening has gone a long way. And the moulds you want on the surface are the white and grey ones; black or blue growth means something other than the intended flora has taken hold.
Ammonia chemistry and wrapping per Gianaclis Caldwell, Mastering Artisan Cheesemaking (Chelsea Green); surface-mould ecology per Paul Kindstedt, Cheese and Culture (Chelsea Green).
History
Brie has Carolingian-era documentation; Camembert was reportedly created by Marie Harel in 1791 in Normandy. The category transformed when Penicillium candidum was isolated and made consistent in the early 20th century — historically the white mold was wild and unpredictable. American bloomy-rind production began seriously in the 1980s-90s with Cowgirl Creamery, Vermont Creamery, and Cypress Grove leading the awakening; the 1989 US ban on raw-milk soft cheeses aged under 60 days continues to shape what can be imported vs produced domestically.
Signature cheeses
- Brie de Meaux AOP
- Camembert de Normandie AOP
- Brillat-Savarin
- Saint-André
- Mt Tam (Cowgirl Creamery)
- Humboldt Fog (Cypress Grove, ash-layered goat bloomy)
- Harbison (Jasper Hill Farm, spruce-wrapped)
Key regions
AOP / DOP designations
- Brie de Meaux AOP (France, 1980)
- Brie de Melun AOP (France, 1980)
- Camembert de Normandie AOP (France, 1983)
- Chaource AOP (France, 1970)
- Coulommiers (PGI candidate)