I feel the ambient temperature has a big effect on the lift of my sourdough starter. I place a cup of water in the microwave and heat it up for 2 or 3 minutes. I then remove the cup and place a thermometer along side my covered bowl of mixed dough. i maintain 78°F to 80°F the whole time by monitoring the temperature, removing the dough and thermometer then reheating the cup of water as needed.

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