respectively errors during the casting operation can thus be avoided and the dimensional accuracy of the cast parts can be maintained even for numerous cycles when used as a lubricating agent in machining processes the necessary cutting force is reduced the advantageous effects of this cooling and release agent were proven in tests which will hereinafter be described in a first test the concentrations for a cooling and release agent according to the present invention were determined at which a pyrolytic decomposition shows no adhesion of residues on the simulated cast part the concentrate used was a solution with 50 by weight of gelatin having a molecular weight of 1000 to 7000 dalton and with 16 to 19 by weight of nitrogen as a protein 1 by weight of citric acid 0 1 ppm of silver acetate as a bactericide 0 1 by weight of potassium sorbate as a preserving agent and water for the rest a steel plate made from the material 1 2343 was first coated with a passivation layer having as its major components manganese phosphate and molybdenum sulphide at a temperature of about 250 u00b0 c this steel plate was subsequently immersed for 10 seconds into a solution with a dry substance content of 0 25 which corresponds to a dilution ratio of the concentrate of about 1 200 a piece of aluminum made from the material alsi 9 cu 3 was placed on the steel plate after the film had dried adhesion of the aluminum piece.