Mosaic eyes in which clones expressing wScer\UAS.cTb under the control of Scer\GAL4tub.PU in a wunspecified background are induced during the first 2 days of pupation show a clear correlation between the presence of pigment in the secondary or tertiary pigment cells are the subretinal pigment; when a clonal cell containing restored pigment is of a secondary or tertiary pigment cell type, then a corresponding patch of pigment is observed in the directly underlying subretinal region. Whenever pigment is detected in the subretinal layer, there is always corresponding pigment in the overlying pigment cells of the retina.