How do I test my rennet?

Over time your rennet can begin to lose some of its strength. Just adding a little more rennet can compensate for this.

One way to test your rennet to see how active it still is is to take a tablespoon of warm milk (35° C) and add a drop of Calcium Chloride and a drop of rennet. It should set in 5 minutes or less. If it doesn’t set in 5 minutes, take another tablespoon of warm milk and add 2 drops. This should give you some idea how much extra rennet you need to add to get a good set.

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