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==Key Stage 4==
{{#ev:youtube|https://www.youtube.com/watch?v=pnTGNAfu6GE}}
===Meaning===
Use a [[Chromatography]] [[experiment]] to produce a [[Chromatogram]] and calculate the [[Retention Factor|Retention Factors (R<sub>f</sub>)]] for they [[dye]]s found within different inks.