FUNDAMENTAL PHOTOS / SCIENCE PHOTO LIBRARY FUNDAMENTAL PHOTOS / SCIENCE PHOTO LIBRARY
Paper chromatogram of six water-soluble inks. The inks used are (left to right); bottle green, violet, English red, Prussian blue,olive green and blue. The constituents of the inks may be identified by the distance they have moved along the filter paper in the time of the test, dependent both on ther absorbtion on the cellulose fibres and the partition between the ink solvent and the water.
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