ch 2 ch 2 o n so 3 na polyoxyethylene carboxylic ester phosphate type str13 and u03b2 naphthalene sulfonic acid formaldehyde polycondensate type str14 examples of the nonionic surface active agents which are advantageously used herein include those of polyoxy ethylene alkyl ether type r o ch 2 ch 2 o n h polyoxyethtlene alkylaryl ether type str15 polyoxyethylene alkyl amine type str16 polyoxyethylene alkyl amide type str17 polyoxyethylene sorbitan fatty ester type str18 wherein r 39 represents an alkyl having 6 to 25 carbon atoms and m an integer having the value of 5 to 50 pluronic type ho ch 2 ch 2 o a ch 3 chch 2 o b ch 2 ch 2 o c h wherein a b and c each have a value greater that 1 and the sum of a b and c has a value of 20 to 300 the tetronic type str19 wherein x through x 34 39 each have a value greater than 1 y through y 34 39 each have a value greater than 1 and the sum of x x 39 x 34 x 34 39 y y 39 y 34 39 and y 34 39 has a value of 20 to 600 these anionic and nonionic surface active agents can be used either singly or in the form of a varying combination of anion anion nonion nonion or anion nonion agents although the selection of an anionic and or nonionic surface active agent is not particularly liminted it is desired to be such that.