Blue-veined
Cheeses inoculated with Penicillium roqueforti (or P. glaucum) that develop blue-green veins through internal channels created by piercing. Roquefort, Stilton, Gorgonzola, plus the American craft blues.
Technical description
Penicillium roqueforti (or P. glaucum for some Italian blues) is added to the milk or curd. Wheels are pierced with stainless steel needles at multiple points during aging — this creates oxygen channels that allow the aerobic mold to colonize and grow through the cheese interior, producing the characteristic blue-green veins. Without piercing, the mold remains inactive. Salt content is typically higher than other categories (3-5%) to control mold expression and balance the sharp flavor.
Aging parameters
Microbial environment
Penicillium roqueforti is dominant (named for Roquefort, where it was first isolated as a single-strain culture). P. glaucum is used in some Gorgonzola production. Both molds are anaerobic-aerobic hybrids that require the oxygen channels from piercing to express the blue color. The natural Combalou cave microflora (including specific Penicillium roqueforti strains) is part of what makes Roquefort legally inimitable.
History
Roquefort is one of the oldest documented cheeses in continuous production — Pliny the Elder referenced it (~AD 79), and Charles VI granted the Roquefort caves their exclusive aging monopoly in 1411, making it the first French cheese with what amounts to a protected designation. Stilton dates to the early 18th century (Cooper Thornhill, Bell Inn). The American blue revolution begins with Maytag Blue (1941, Iowa) but accelerates in the 2000s with Rogue Creamery, Point Reyes Original Blue, and Jasper Hill's Bayley Hazen Blue establishing world-class American production.
Signature cheeses
- Roquefort AOP (sheep, Lacaune required, aged in Combalou caves)
- Stilton PDO (cow, Nottinghamshire/Derbyshire/Leicestershire)
- Gorgonzola DOP (cow, Lombardy/Piedmont)
- Cabrales DOP (raw cow/goat/sheep blend, Asturias)
- Bleu d'Auvergne AOP
- Bleu des Causses AOP
- Fourme d'Ambert AOP
- Rogue River Blue (Rogue Creamery, 2019 World Cheese Champion)
- Bayley Hazen Blue (Jasper Hill Farm)
Key regions
AOP / DOP designations
- Roquefort AOP (France, 1925 — one of the first ever AOPs)
- Stilton PDO (UK, 1996; legally protected since 1969 nationally)
- Gorgonzola DOP (Italy, 1996)
- Cabrales DOP (Spain, 1996)
- Bleu d'Auvergne AOP (France, 1975)
- Bleu des Causses AOP (France, 1953)
- Fourme d'Ambert AOP (France, 1972)
- Picón Bejes-Tresviso DOP (Spain)
- Valdeón PGI (Spain)