"INNOCENCE LOST" -Photograph of crystalline citric acid found in citrus fruit"Innocence Lost" will add a warm and vibrant tropical look to any setting. Citric acid crystals were grown by evaporation on a glass microscope slide then photographed through a microscope. Citric acid is found naturally in citrus fruits. The crystal facets create the colors naturally by refracting the transmitted white light, separating it into the colors of the spectrum.