However, other triglyceride oils such as the liquid fractions of beef tallow and synthetic triglyceride oils are also suitable.Liquid paraffin oils, isoparaffin oils and synthetic hydrocarbons as well as di-n-alkyl ethers with a total of between 12 and 36 carbon atoms, in particular 12 to 24 carbon atoms such as, for example, di-n-octyl ether, di-n-decyl ether, di-n-nonyl ether, di-n-undecyl ether