Abstract: An antimicrobial mixture comprising or consisting of: one or more compounds of the formula (I) their salts or solvates, wherein R1 and R2 in each case independently of one another are chosen from the group consisting of: H, OH, F, Cl, Br and I, and wherein X in each case denotes: (CH2)m where m=1, 2 or 3 or OCH2n where n=1, 2 or 3 or O—CH2—CH(R3) where R3?CH3 or CH2OH or (CH2—OpCH2 where p=1 or 2, wherein in the compound(s) of the formula I a primary alcohol function CH2OH is optionally replaced by a radical which is chosen from the group consisting of CH2OR4, COOH and COOR4 and/or a secondary alcohol function CHOH is optionally replaced by the radical CHOR4, wherein each R4 denotes an aliphatic or aromatic radical, independently of the meaning of further radicals, and one, two or more compounds chosen from the group consisting of the tropolones of the formula (II) wherein the substituents R5, R6, R7, R8, R9 independently of one another have the following meaning: H; linear or branched