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CHROMATOGRAPHY IS A TERM THAT DENOTES A myriad of laboratory separation processes based on a differential migration phenomenon. It is particularly effective for the resolution and separation of complex mixtures; hence, it can be used as a chemical preparatory method or, more importantly, as an analytical tool. This potent analytical technique has been widely used in the paint industry for a broad range of coating applications from everyday routine analysis to fundamental research into the nature of organic coating systems. Its use has been so extensive that virtually every type of material used in paint has been affected by chromatography. Chromatography possesses certain inherent features that offer distinct advantages over conventional analytical techniques: complex mixtures, including isomers and homologs, can be separated; most of the equipment is relatively simple and inexpensive; chromatographic procedures are applicable to a broad spectrum of chemical types and are adaptable to both micro- and macro-size samples; and chromatography is capable of both qualitative and quantitative functions even when applied to multicomponent systems. The term chromatography was coined by Tswett  who, in 1906, used powdered chalk and petroleum ether to separate plant pigments into colored zones of isolated pigment. The technique, as described by Tswett was largely ignored for a long time, and it was not until the late 1930s and early 1940s that Martin and Synge  applied the technique successfully to colorless materials, but the name has persisted. The term is currently used to signify a broad group of separation techniques, most of which are independent of color.
Domingo, Rolando C.
DSM Desotech Incoroporated, Elgin., IL
Montemayor, Rey G.
Imperial Oil Ltd, Sarnia, Ontario