I tried to generate LVDC titanium and got nothing but gas bubbles on the two Ti electrodes, until I added some CS/EIS. An initially weak Tyndall effect began to grow steadily, or so it seemed. (TE is subjective.)
By the way, there may be an overlooked method of measuring colloid concentration or size. Searle (1919) mentions that refractive index changes measurably in colloidal sols of gold, silver and copper.(p. 81, The Use Of Colloids In Health And Disease.) Hollow prisms for observing refraction by liquids are on the market. I conjecture that viewing a finely graduated ruling through such a prism with a theodilite or transit would give a sensitive way of measuring refractive index, and additional info about the sol. Best regards, Matthew
