The invention relates to foam production equipment comprising:—a first module (A) comprising a principal outlet and delivering at said principal outlet a mixture comprising a principal liquid and at least one surfactant,—a second module (B) coupled to the principal outlet of the first module (A) and producing a foam which comprises at least the principal liquid, the at least one surfactant and at least one principal active product, from the mixture delivered by the principal outlet of the first module (A), the mixture comprising the at least one principal active product or the second module (B) comprising, in addition, means configured such that the foam produced by the second module (B) comprises the at least one principal active product, characterized in that said at least one principal active product is chosen from dyes, fluorescent products, chemical and/or biological labels, irritant products, gases, products which destroy the muscle and/or thinking capacities of a living being and radar reflectors. The invention also relates to a foam which can be produced by such equipment and which advantageously has an expansion coefficient greater than 10.
