81 6 points measured at 20 u00b0 and 88 5 points measured at 60 u00b0 that of the film from the sample containing butanone oxime was 82 1 and 89 9 points at 20 u00b0 and 60 u00b0 respectively the color co ordinate b of a corresponding paint film with a 100 u03bcm wet film thickness according to cielab corresponding to din 6174 determined after a storage period of 1 week resulted in a value when the mixture according to the invention was used that was 0 300 points lower than the tristimulus value of the sample containing butanone oxime determined under identical conditions as a result of which a reduced yellowing of the film was indicated 3 0 10 g of a cobalt containing drier trade name octa soligen cobalt 6 from borchers gmbh contains 6 wt co and 0 4 g of a calcium containing drier trade name octa soligen calcium 4 from borchers gmbh contains 4 wt calcium were added to a coating composition consisting of 30 0 g of a long oil alkyd resin trade name alkydal u 601 from bayer ag and 2 2 g white spirit d 60 0 005 g of the mixture listed under d was added to the formulation and the time taken for a skin to form on the surface of a closed 125 ml pe beaker filled to approx u00bc was established skinning was prevented for more than 50 days in this case by way of comparison the skinning time for a sample without anti skinning additive determined under identical conditions was 6 days the skinning time.