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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 [[ink]]sinks.
===Method===
#Use a ruler to measure the distance that the [[solvent]] has traveled up the paper.
#Use a ruler to measure the distance that the different [[dye]]s have traveled up the paper.
#Use the following equation to find the [[Retention Factor]] for each [[dye]]::<math>R_f = \frac{d_c}{d_s}</math>
:Where:
:R<sub>f</sub> = [[Retention Factor]]
:d<sub>c</sub> = distance moved by the [[chemical]]
:d<sub>s</sub> = distance moved by the [[solvent]]