Abstract: A kit for mixing substances for the creation of cosmetic products comprises: a first member containing therewithin a first substance and being closed at one end by a breakable cover; a second member containing therewithin a second substance and being closed at one end by a breakable cover; and an intermediate member able to receive in a relationship of engagement the ends provided with the breakable cover of the first and second members, said intermediate member comprising cutting means able to tear said breakable covers of the first and second members to allow discharge of the respective substances and defining a mixing chamber able to allow the passage of said substances for mixing thereof so as to obtain a ready-to use cosmetic product.