Cheese Troubleshooting: Bitter, Rubbery, No Set, Won't Stretch
Cause, then fix — for your next batch, because this one is already made.
| Problem | Likely cause | Fix next batch |
|---|---|---|
| Bitter cheese | Over-acidification, too much rennet, or microbial rennet in a long-aged cheese | Reduce culture dose, rennet to the recipe, and use calf rennet or FPC for cheeses aged past ~6 months |
| No curd set / very soft curd | Weak or old rennet, chlorinated dilution water, calcium-poor pasteurized milk | Fresh rennet diluted in cool non-chlorinated water; add calcium chloride (not for mozzarella) |
| Shattering curd | Over-acidified milk or curd cut too late — rennet keeps firming past the point | Track times and pH; cut at the recipe's firmness, not the clock alone |
| Sour, crumbly aged cheese | Too much culture or too long a ripening before renneting | Split or reduce the packet — over-dosing is a defect, not safety |
| Mozzarella won't stretch | Curd pH outside 5.1–5.3, or calcium chloride in the make | Test a small piece in hot water as pH falls; stretch in the window; no CaCl2 in mozzarella |
| White mould patchy or slimy | Cave humidity or temperature off; Geotrichum missing | Pair PC with Geo, hold the cave at 50–55°F with high humidity, turn on schedule |
| No eyes in swiss | Propionic culture under-dosed, omitted, or the warm phase skipped | Add Propionic Shermanii with the starter and give the wheel its warm-room weeks |
Most fixes are next-batch fixes. That is the nature of a living food — keep notes on dose, times and pH, and the second wheel is where the learning pays off.
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