nd 30% by weight, of the total composition. [0128] The solvents are preferably lower alkanols (C1-C6) such as ethanol and isopropanol and the alkane diols such as propylene glycol, glycerol and pentanediol. [0129] The physiologically acceptable medium preferably consists of water (in particular distilled or demineralized water) or a water/alcohol mixture, in particular water/ethanol. [0130] The qu