Hi, Lisa. Unless the spoon being used is a) aluminum and b) sits in VERY acidic starter for about 3 days (which would start to corrode the metal and give the starter an off flavor), there's no reason not to use a metal spoon to stir starter. I use our dough whisk to stir things together when feeding my starter; it's the perfect tool for the job. And a wooden spoon works just fine, too.

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