Why Is Paper Chromatography Classified as Liquid–Liquid?

Points on why paper chromatography classified as liquid liquid:

• Paper chromatography is classified as a liquid–liquid chromatographic technique because separation involves interactions between two liquid phases on paper. 
• One liquid phase is immobilized within the paper fibers while another liquid phase moves across the surface as the mobile phase. 
• Separation occurs through repeated distribution of components between these two liquid phases.

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