WITHIN the last twenty years, chromatography has become increasingly important as an analytical tool. The purpose of this article is to review the uses of partition chromatography on paper, which, ...

Introduction Do you love to use bright and vibrant colored art supplies such as markers or paints? Do you ever wonder how these colors are made? The variety of colors comes from colored molecules.

THE surface of filter paper, in contact with water, has a slight negative charge 1, and this may account for the non-adsorption of certain colloidal electrolytes such as dyes of the ‘acid’ type, when ...