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Caption: Scientist examining a test tube containing a liquid obtained using the technique of column chromatography. The equipment for this is seen on the bench. Chromatography is used to separate out several components of a liquid mixture. It is especially useful for separating out components with similar physical properties. The column (at right) is filled with a porous gel. Different substances will travel down the column of gel at different rates. Two bands of a red/brown colour can be seen in the column. These are different components of a mixture that is being separated. The technique can be used to purify and isolate a required product.

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Keywords: analysis, analytical, apparatus, biochemistry, biology, biotechnology, chemical, chemical technique, chemistry, chromatography, column, equipment, female, industry, laboratory, liquid, purification, purifying, researcher, scientist, separating, separation, technician, technology, woman

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