The organic solvents were evaporated to
isolate the solid product, which was then washed with toluene
and allowed to dry. The product was collected, weighed, and then
analyzed by thin-layer chromatography (TLC) using standard
samples of anthracene and anthraquinone, running three spots
side by side on the same plate. An ultraviolet (UV) lamp was used
to visualize the spots on the TLC plate. If the product was not
pure, further washings with toluene were performed until the
TLC showed pure product