The disinfection and/or conservation and/or reduction and/or control of the microbial contamination of aqueous dispersions and/or aqueous mineral matter suspensions, comprises: (a) increasing the concentration in hydroxyl ions in the dispersions and/or the suspensions, to at least 1x10 -2>； mole/1, and (b) dispersing and/or crushing the aqueous dispersions and/or suspensions. Before, during or after stage (a), a dispersant and/or a crushing agent is added. The process further comprises optionally reducing the concentration of hydroxyl ions to less than or equal to 1x10 -2>； mole/l, and optionally adding a substance with microbicide effect and/or implementing a physical process of decontamination. Independent claims are also included for: (1) an aqueous dispersions and/or suspensions of mineral materials； (2) a mineral formulations； (3) paper formulations； and (4) aqueous paints such as lacquers and varnishes.
