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By Harold McGee
Published 2004
The trick is to mix the two materials as evenly as possible while losing as little air as possible. Typically, between a quarter and half of the foam volume is lost at this stage. The traditional method of mixing base and foam is to vigorously stir a quarter of the foam into the base to lighten it, then use a spatula to “fold” the two together by repeatedly scooping some base, cutting vertically through the foam, and depositing the base along the cut surface.