Figure 3: Skin of the different age groups stained with Orcein stain showing the distribution of the elastic fibres (arrowheads). Note epidermis (E) and dermis (D). (a) A ten day old rat (100X). (b) A twenty day old rat (100X). (c) A two month old rat. (d) A six month old rat. (e) A one year old rat (100X). (f) A two year old rat (100X). (g) Optic density of elastic fibres (blue colour) of a two year old rat (200X).