Paper chromatography is an analytical method technique for separating and identifying mixtures that are or can be colored, especially pigments. This can also be used in secondary or primary colors in ink experiments. This method has been largely replaced by thin layer chromatography, however it is still a powerful teaching tool. Double-way paper chromatography, also called two-dimensional chromatography, involves using two solvents and rotating the paper 90° in between. This is useful for separating complex mixtures of similar compounds, for example, amino acids.
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Famous quotes containing the word paper:
“It was because of me. Rumors reached Inman that I had made a deal with Bob Dole whereby Dole would fill a paper sack full of doggie poo, set it on fire, put it on Inman’s porch, ring the doorbell, and then we would hide in the bushes and giggle when Inman came to stamp out the fire. I am not proud of this. But this is what we do in journalism.”
—Roger Simon, U.S. syndicated columnist. Quoted in Newsweek, p. 15 (January 31, 1990)