soaps for comparison edta tetra sodium ethylenediaminetetraacetate glna sodium gluconate saa a polyoxyethylene eo9 laurylether saa b monoethanolamide coconut oi fatty acid with 5 mol eo added thereto 250 grams of each substance and 200 mililiters of water were added to 500 grams of waste kitchen oil contained in a 3 liter stainless steel container and the mixture was boiled for 30 minutes over a direct gas flame then the state of solidification the production of suds and the skin irritation tendency of each soap were tested the following results being obtained ______________________________________solidification suds skintime formation irritationmin reaction mm fa impression______________________________________1 25 abrupt bumping 24 0 50 42 60 gt brisk stirring 12 0 02 2 necessary3 60 gt brisk stirring 5 0 18 2 necessary4 60 gt brisk stirring 10 0 03 3 necessary5 50 smooth 20 0 05 36 60 gt smooth 18 0 07 2 2 25 smooth 24 0 03 2______________________________________ note 2 soap made by the substance of the present invention skin irritation wa evaluated in terms of free alkali fa and the impression was evaluated by five monitors who used the soaps for hand washing ten times at 40 u00b0 c by comparing each soap with a commercially sold soap positive values in ascending order were given for impressions of better quality negative values in descending order for impressions of poorer quality and zero in the case of no difference in comparison ______________________________________ 3 4 5 7 8 9 10 11______________________________________sodium carbonate 70 25 30 52 5 22 50metasilica 19 40 10 orthosilica 34 5 10 10 10 10edta 4na 5 10 5 10 10 69 2 5nta 8.