Use of a liquid containing as the main component acyclic saturated aliphatic hydrocarbons having a lower proportion of aromatic hydrocarbons 1% by weight and to which has been added, as an additive, organic sulfuric compounds in a concentration of at least 0, 01% in weight and at most 10% by weight, in which at least two sulfur atoms are linked to each other in the molecule, which do not have any charge on the molecule or having a partial negative charge in the molecule, as a matter dielectric treatment metal electric-erosive machining, whereby the organic compounds containing sulfur moieties cyclic hydrocarbon having conjugated double bonds.
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