| http://www.w3.org/ns/prov#value | - In this case, it is particularly expedient for the layer which is free of effervescent agent to be covered on both sides by a layer containing an effervescent mixture, since then carbonic acid will in any case be formed underneath the layer which is free of effervescent agent, providing an additional "stirring effect for the disintegration and dissolution of the middle layer which is free of an e
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