Eight photographs of thin-layer chromatography plates, each opening straightened and read: dye mixtures on a bench, the pigments of flower petals and of a fresh leaf, and plates glowing under ultraviolet light.
Six come straight from Wikimedia Commons, each credited with its author and its licence. Open one, move anything on it, and take it away as a figure or a table of Rf values.
Straighten a picture of a thin-layer chromatography plate, mark its spots and read every Rf value, then weigh its eluent on a solvent scale. The tool needs JavaScript, because the picture is read in your browser.