Abstract: Single piece capsules, produced, filled and sealed in a single operation, also known as soft shell capsules, having a special foam wall structure, obtained by a microdispersion of a gas in an aqueous mixture of dry gelatin and one or more plasticizers.The capsules are formed by processing, on soft shell capsule manufacturing machines, foamed ribbons, cast from a film forming mixture obtained by a microdispersion of a gas in an aqueous mixture of gelatin and one or more plasticizers; optionally with the inclusion of a coloring agent, an opacifying agent, a foam stabilizer, a gelatin extender, a preservative, a flavoring agent, a sweetening agent, or a drug.By a suitable choice of the gas proportion in the capsule wall and its microdispersion level, it is possible, within certain limits, to control the capsule wall disintegration speed and its opacity.