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Mix the baking soda, corn starch and magnesium citrate in a bowl.
Pour half the mixture into a container for storage, the other half into a container for use. I chose a covered glass dish and added a powder puff to apply it with.
The storage container sould have a tight fitting lid. Store it in a dry location.
You can get the Magnesium Citrate Powder at any place that sells vitamins.