The Safety Triangle
Also known as Dose, Exposure, Growth conditions, Preservation methods, Prevalence, Reduction, Survival
The Roof of the Temple: the three forces that together decide whether a cure is safe to eat, which are water activity, pH and microclimate.
The Safety Triangle is the roof of the Curesmith's Temple, and the part that most directly keeps you well. It is made of three forces a curesmith manages together: water activity, how much water is available to microbes; pH, how acid the meat is; and microclimate, the temperature, humidity and airflow it matures in.
They are drawn as a triangle because no single one makes a cure safe on its own. A ham is preserved mainly by drying, so its water activity carries the load. A fermented sausage leans first on a fast pH drop, then on drying. Both depend on a microclimate that lets the work happen cleanly. Take any corner away and the others must carry more. This is the principle of hurdles: several modest barriers together do what no one of them could alone.
Salt and the curing salts work underneath the triangle, lowering water activity and, with nitrite, holding back Clostridium botulinum directly while the slower forces develop. But the triangle is the frame every safe cure is judged against: is the water activity low enough, is the pH low enough where it applies, and did the microclimate let both happen evenly.
Temple element. Roof, Safety Triangle