____ is a ____ technique used to separate mixtures of ____ substances.These are often ____ substances such as food colourings, inks, ____ or plant pigments.Chromatograms can be used to match known pigments with those in a mixture.On a chromatogram, one spot means that the substance is ____. An impure substance produces two or more spots. When a solution contains more than one dissolved substance, those substances can be separated using chromatography. This is especially easy when the ____ substances are different coloured pigments. An ink or food colouring is usually made from more than one pigment dissolved in water. Chromatography can be used to separate the ____ in ink or food colouring.Chromatography works because some of the pigments are more soluble in water than others. Pigments with a higher ____ move further up the ____.

chromatography

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