Cheesemaking 101 — a working glossary.
Short, plain answers to the terms you'll meet over and over. Each entry links onward to a longer article when there's one worth reading. Skim it, bookmark it, come back when a word trips you up.
Milk, cultures, and the things that turn milk into cheese
The starting ingredients and the microbes that do the work. If you're confused about what mesophilic means or why raw milk matters, start here.
Mesophilic vs thermophilic culture
Mesophilic cultures work between roughly 20–30°C and produce cheeses like Cheddar, Brie, and Gouda. Thermophilic cultures work hotter, 35–55°C, and give you Parmesan, Swiss, and Mozzarella.
Both are lactic acid bacteria that convert lactose into lactic acid. The difference is temperature tolerance: thermophilic strains survive the higher cook temperatures that drive moisture out of hard Italian and Alpine styles. Mesophilic strains die off above ~39°C, which is why they're reserved for cheeses that never get that hot.
Starter cultures explained →Raw vs pasteurised milk
Raw milk still carries the native microbial community from the animal and the dairy; pasteurised milk has been heat-treated to kill most of it. Raw-milk cheeses taste more of their place. Pasteurised cheeses are more predictable.
Pasteurisation at 72°C for 15 seconds kills pathogens but also removes the wild cultures and some of the enzymes that contribute to long-aged flavour. This is why most traditional raw-milk cheeses are aged 60+ days — the aging itself becomes the safety control.
Raw vs pasteurised milk →Casein
The milk protein that makes cheese possible. It clumps together when acid or rennet acts on it, forming the curd.
Casein is roughly 80% of the protein in cow's milk, organised into tiny particles called micelles. Whey proteins (the other 20%) stay dissolved and drain off. Every cheese texture — rubbery, crumbly, melty — is a story about how the casein network was arranged and then rearranged during aging.
Casein and coagulation →Rennet
The enzyme (chymosin) that sets milk into curd by cutting one specific bond in casein. Can be animal, vegetable, microbial, or fermentation-produced (FPC).
Traditional rennet comes from the stomach of young ruminants. Modern FPC rennet is bioengineered chymosin — identical at the molecular level, vegetarian, and more consistent. Thistle and fig extracts are the classic vegetable rennets, used in some Iberian cheeses.
Rennet and coagulation →
Chemistry and process — what's actually happening in the pot
The variables a cheesemaker watches and the transformations those variables cause. Mostly pH, moisture, and salt.
pH
A measure of acidity. Fresh milk sits at ~6.6; finished cheeses usually land between 4.6 and 5.3 depending on style.
pH is the single most informative variable in cheesemaking. Every 0.1 unit change in pH has measurable effects on curd texture, moisture retention, and rind behaviour. Serious cheesemakers measure pH, not time.
pH and acidity in cheesemaking →Titratable acidity (TA)
Total acid present in a sample, measured by titration. Useful alongside pH, but measures a different thing.
TA counts every acid molecule; pH only measures the free hydrogen ions actively interacting with the casein. TA can rise while pH sits flat if the acid is being buffered. Both readings together tell a fuller story.
Curd and whey
Curd is the solid part of coagulated milk — the future cheese. Whey is the liquid that drains off.
The curd holds the casein, most of the fat, and some of the water. Whey carries off the remaining water, dissolved salts, lactose, and whey proteins. What you do to the curd after cutting — stir, cook, press, stretch — determines the finished texture.
Water activity (a_w)
How 'available' the water in a cheese is to microbes. Controlled mostly by salt. Low a_w = longer shelf life.
Hard cheeses like Parmigiano have very low water activity, which is why they age for years without spoiling. Soft cheeses with high water activity ripen quickly and have short shelf lives. Salt is the main lever.
Moisture, texture and water activity →Proteolysis
The slow breakdown of casein into smaller peptides and free amino acids during aging. The main engine of aged-cheese flavour.
Proteolysis is why a one-year Cheddar tastes nothing like a one-month Cheddar. Different enzymes — from residual rennet, starter bacteria, and surface microbes — each produce different peptides, some savoury, some sweet, some bitter. Balance is the affineur's work.
Enzymatic ripening and flavour development →
Styles, rinds, and what to call what
A field guide to the main cheese style families and the rinds that define them.
Pasta filata (stretched curd)
Italian for 'spun paste' — cheeses whose curd is heated in hot water or whey and stretched until plastic. Mozzarella, Provolone, Scamorza, Caciocavallo.
The stretching aligns the casein proteins into long fibres, giving pasta filata cheeses their characteristic pull and melt. Timing the stretch to the correct pH is everything — too acidic and the curd falls apart, too alkaline and it won't stretch.
Pasta filata and stretched curd →Soft-ripened cheese
Bloomy-rind cheeses like Camembert and Brie. Ripen from the outside inward under a white mould (Penicillium candidum).
Soft-ripened cheeses explained →Washed-rind cheese
Cheeses whose rinds are repeatedly washed in brine, wine, or spirits during aging — Époisses, Taleggio, Munster. The wash feeds Brevibacterium linens, which produces the orange-pink rind and the aromatic punch.
Washed-rind cheeses explained →Blue cheese
Cheeses inoculated with Penicillium roqueforti and pierced so the mould can grow through the interior — Roquefort, Stilton, Gorgonzola.
The piercing is critical: P. roqueforti needs oxygen to sporulate and produce its signature blue-green veins. Without piercing, the inoculation sits dormant.
Blue cheeses explained →Hard cheese
Low-moisture, long-aged cheeses that can store for months to years — Parmigiano-Reggiano, aged Gouda, Gruyère, Manchego.
Hard cheeses explained →Natural rind
A rind that forms on its own through drying and colonisation by ambient moulds and yeasts — no wash, no mould inoculation. Classic on tomme-style cheeses and Mimolettes.
Aging, affinage, and terroir
What happens between the mould and the cheese board, and why the same recipe gives different results in different places.
Affinage
The craft of aging cheese — controlling humidity, temperature, and rind care to coax a wheel to its best expression. An affineur is the person who does it.
Affinage and aging cheese →Terroir
The idea that a cheese reflects its place — the pasture, the climate, the ambient microbes, the traditional practices of a region. Borrowed from wine.
Terroir is not mystical. It's a shorthand for a bundle of real, measurable variables: what the animals eat, the seasonal fat and protein profile of the milk, the humidity of the aging space, and the local microbial community that colonises the cheeses. Strip any of those away and the cheese becomes something else.
Terroir and regional cheese character →Cave-aged
Aged in a natural cave at 90–95% humidity with the resident wild microflora. Produces characterful, sometimes unpredictable cheeses.
Cellar-aged
Aged in a controlled room at 80–85% humidity with deliberate culture choices. More consistent than cave-aged, with tighter flavour control.
Tools, measurements, and the numbers that matter
The handful of tools and numbers that distinguish a working cheesemaker from someone following a recipe on faith.
pH meter
A digital probe that reads pH directly. The single most useful piece of kit for anyone serious about cheesemaking.
A proper cheese pH meter has a spear-tipped electrode you can push into the curd or the finished wheel. Calibrate before every make with fresh 7.0 and 4.0 buffer solutions. Store the probe in KCl solution, never water.
Salt percent
The proportion of salt in a cheese, usually expressed as a percentage of curd weight or finished cheese weight. Typical range: 1–4%.
Always check which base weight a recipe means. 2% salt of curd weight is a different absolute dose from 2% of milk weight. The Cheese Lab analysis clarifies this explicitly for every recipe.
Fat content
The proportion of fat in the milk or finished cheese. Whole cow's milk is ~3.7%. Double-cream cheeses fortify with added cream; skim-milk cheeses pull fat out.
Aging (weeks / months / years)
How long a cheese is matured before it's eaten. Fresh cheeses eat in days; Parmigiano-Reggiano ages 24+ months; some hard Dutch cheeses go beyond four years.
Common beginner questions
Where should a total beginner start?+
Fresh styles — ricotta, paneer, or a simple chèvre. They teach you acid coagulation, draining, and salting without the weeks-long aging commitment. Once you've made ten of those, move to a pressed-curd cheese like a Caerphilly or a young tomme.
What's the minimum kit for serious cheesemaking at home?+
A stainless stockpot, a long curd knife, a thermometer, a digital pH meter, a draining mat, a press (can be improvised), and a dedicated aging space (a wine fridge is ideal). Everything else is optional.
Is cheesemaking safe?+
With pasteurised milk and reasonable hygiene, yes. Raw-milk cheeses need more care and are typically aged 60+ days so the acid and dryness kill pathogens. If you're ever in doubt, throw the batch out — one bad wheel is cheaper than one bad batch of illness.
Can I really design a cheese without making it first?+
Sort of. The Cheese Lab configurator gives you a science-aware analysis of whether your specification would work — viability, likely texture, flavour profile, wine pairing. It's not a replacement for making the cheese. It's a way of thinking through the decisions before you commit a batch.