The present invention relates to a
system for producing an in-situ foam comprising one or more poly (amino acids) (A), one or more components (B) capable of reacting with said poly (amino acids) (A) and one or more amphoteric polymers (C) wherein component (B) is selected from the group consisting of reducing sugars, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, and 2, 3-
dihydroxyacetone,
glycolaldehyde,
glyceraldehyde, or any mixture thereof.