Cheese — Washed rind — Gourmet Gastronomer

A surface-ripened style whose repeated brine (or similar) washes select a bacterial smear — orange to pink, savory, sometimes aggressive — rather than a white mold bloom.

Washed rind is a microbial choice you keep making. CDR treats washed-rind and smear-ripened as interchangeable names for cheeses whose characteristic flavors and textures come from microbial growth on the surface ¹. The smear they describe is water with diluted salt (they place it at about 3–6 percent) plus a blend of bacteria and typically yeast, rubbed, brushed, or sprayed on at least once a day early in affinage ¹. Color goes orange, red, or brown depending on the colonies. It is neither a marinade nor a white bloomy coat. Rind anatomy lives on Cheese rind. The defining work is the wash.

CDR names yeasts Debaryomyces hansenii and Geotrichum candidum among the organisms used for smeared cheeses such as Limburger ². Surface communities can also include lactic acid bacteria, Arthrobacter, corynebacteria, Brevibacterium, staphylococci, and micrococci; the inoculated starter is often overtaken by house flora ¹. Beer or wine in a wash is still a salt-and-water ecology with extra sugars and microbes — a cousin of Wine as a wash liquid, not a second cheese physics.

Named U.S. example: Limburger, not “munster” #

21 CFR 133.152 is a washed-surface identity: after dry-salting, the cheese is cured with frequent applications of a weak brine solution to the surface until the proper growth of surface-curing organisms is obtained ³. Milkfat at least 50 percent of solids; moisture not more than 50 percent. If dairy ingredients are not pasteurized, the cheese is cured at not less than 35 °F for at least 60 days ³. U.S. Muenster is a different named food: pasteurized dairy ingredients and an optional vegetable-oil rind coat, with no smear wash in the standard. Do not collapse French washed Munster, U.S. muenster, and this style into one word.

The room is a system; the vat still decides #

FAO’s ripening stage is enzymatic change at the surface in these styles ⁴. CDR: as the cheese ages, flavor compounds from the surface microbiota move inward; the paste also softens from the outside in ¹. Their shop warning is the same as for other aged cheese: the cheese is made in the vat. Moisture and acid development have to be right before the room can help. Defects created in the vat are often blamed on the cave ¹. Composition plus looking: Affinage and CDR’s moisture-fat-pH-salt checklist ⁵.

Humidity, temperature, airflow, and air exchange work together. CDR’s professional targets: an aggressive smeared-rind cheese in a room at 98 percent relative humidity and up; a molded (bloomy) rind at 90–95 percent ¹. Soft-type surface-ripened cheeses they place around 55–60 °F; hard-type around 40–55 °F ¹. Those are ripening-room ranges for plants, not a home schedule. Surface-ripened rooms also shed ammonia and carbon dioxide; that is an air-exchange problem, not a flavor garnish ¹.

Wash recipes, wooden-board rules, and pathogen controls depend on the specific make. See Food safety.

What to notice #

Look: even orange-to-pink smear, tacky not slimy-rotten. Smell savory, oniony, or barnyard in a clean way; a drain-pipe stench with a collapsing paste is a failure. Feel a paste that yields from the rind inward. Taste paste and smear separately. Cheese cultures chooses who you inoculate; house flora still shows up. Return to Cheese.

Sources & further exploration

Cited in this article

Environmental Conditions for Aging Surface-Ripened Cheeses — David Niemiec, Andy Johnson. Dairy Pipeline, Center for Dairy Research, University of Wisconsin–Madison. 2022 — Dairy Pipeline vol. 34 no. 2. Washed-rind and smear-ripened used interchangeably. Smear is water with diluted salt (~3–6%) plus bacteria and typically yeast. Molded-rind humidity 90–95%; aggressive smeared-rind 98%+. Cheese is made in the vat; room defects are often vat composition.
Challenges with Controlling Yeast and Mold Growth in Cheese — Dean Sommer. Dairy Pipeline, Center for Dairy Research, University of Wisconsin–Madison. 2019 — Dairy Pipeline vol. 31 no. 2. White mold (Penicillium camemberti) for bloomy rinded cheeses like Brie and Camembert; yeast (Debaryomyces hansenii and Geotrichum candidum) for smeared cheeses like Limburger.
21 CFR § 133.152 — Limburger cheese — U.S. Food and Drug Administration (text via Cornell LII) — Named U.S. washed-surface identity: milkfat at least 50% of solids; moisture not more than 50%. After salting, cured with frequent applications of a weak brine solution to the surface until surface-curing organisms develop. If dairy ingredients are not pasteurized, cured at not less than 35 °F for at least 60 days.
Small-Scale Dairy Farming Manual — Technology Unit 10.3 Small Scale Cheese Making — Food and Agriculture Organization of the United Nations — Technical notes on coagulation (acid vs enzyme), casein vs whey proteins, syneresis after cutting, salting, and ripening. Training-course material, not a U.S. safety regulation.
Successful Cheesemaking: Getting Back to Basics — Dean Sommer. Dairy Pipeline, Center for Dairy Research, University of Wisconsin–Madison. 2015 — Dairy Pipeline vol. 27 no. 2. Moisture, fat, pH, and salt as compositional levers; aging as periodic evaluation under temperature and humidity, not a calendar alone.

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