a procedure for detecting microorganisms by bioluminescence in an aqueous formulation containing an ase or hase - type polymer , which implements at least one step of dilution of the aqueous formulation . this dilution step , and notably the regulation of the dilution factor , allows the bioluminescence technique , up to now ineffective on this type of products , to be implemented . it can henceforth be used on these ase or hase - type polymers , but also on products containing them , such as a paper coating , paint , lacquer , varnish or stain .