50 g of eg and adding 20 g of water thereto each solution in comparative examples 2 7 was obtained by mixing and regulating every material to result in the composition wt shown in table 2 in the same manner as that in comparative example 1 table 2______________________________________comparativeexamples 2 3 4 5 6 7______________________________________zonen f 30 30 30 30 30 30water 20 30 40 15 25 35eg 50 40 30 55 45 35______________________________________ the solutions according to examples 1 8 and comparative examples 1 7 were enclosed in glass containers and put in of 60 u00b0 c of the thermostat and 7 days later their residual rates of c1 mit wt were measured by high pressure liquid chromatography table 3______________________________________examples 1 2 3 4 5 6 7 8______________________________________content 88 97 90 87 84 86 84 86______________________________________ table 4______________________________________comparativeexamples 1 2 3 4 5 6 7______________________________________content 0 0 0 0 0 0 0______________________________________ it is proved that the residual rates in the solutions containing a branched cyclodextrine are higher one hundred grams of a solution was obtained by mixing 20 g of kathon lx plus concentrate with 51 g of water and further adding 29 g of isoeleat l 20 g of a branched cd.