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The characteristic colors of porphyrins is also due to the conjugation.
An examination of the porphyrin structure reveals that individual pyrrole units comprise the overall structure. As an aromatic compound, pyrrole can participate in electrophilic aromatic substitution reactions to form the porphyrin (your report should discuss the mechanism in great detail, including the regiochemistry). The initial porphyrinogen product is not fully aromatic, but oxidation from atmospheric oxygen in the presence of the Lewis acid silica gel allows formation of the fully conjugated porphyrin product. Using benzaldehyde as the electrophile will result in a phenyl substituent on each carbon that links the pyrrole units...
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