le an alkylphenol.A suitable example of a member of this class of compounds is octylphenoxypoly-(ethyleneoxy) ethanol, wherein R is an octylphenoxy group and R' is a hydrogen and n is nine.In a suitable glass container is placed 9.9 gm. of octylphenoxypoly(ethyleneoxy) ethanol, dissolved in 50 ml. of water to which is added 0.1 gm. of potassium iodide.