Quick Answer
To test a sourdough starter's readiness, perform a float test, where the starter floats on water, or check its expansion after 4-5 hours at room temperature, with a 1:1:1 ratio of flour, water, and starter. The starter should be bubbly, frothy, and nearly double in size. If it passes these tests, it's ready to use.
Visual Test Methods
A sourdough starter’s readiness can be assessed through visual observations. The float test requires measuring 1/2 cup of water and gently placing the starter into it. If the starter floats, it’s ready for use. Another method is the “expansion test,” where the starter is mixed with a 1:1:1 ratio of flour, water, and starter, then allowed to rest at room temperature for 4-5 hours. The starter should nearly double in size during this time.
Quantitative Measurements
In addition to visual observations, sourdough starters can be tested through quantitative measurements of pH, density, or yeast activity. A pH meter can be used to measure the starter’s acidity, which should be around 3.5-4.5 for a healthy starter. Alternatively, the starter can be weighed and measured for density. A healthy starter will have a specific gravity of 1.02-1.03, indicating optimal yeast activity.
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