Juglans neotropica being ripe. The sap of the fruit husk is a strong dye and can stain hands and clothing. The nut inside is within a much harder and more difficult to crack shell than Persian walnuts, but the meat inside is comparable in flavour, perhaps a bit sweeter. "Tocte", the fruit of the Andean walnut, are often sold in the farmer's markets of Ecuador. The process of husk removal often stains the shells of the nuts black. Like all walnuts, unripe fruit husks produce a strong yellow dye that does not require mordant; ripe fruits produce a strong red to brown
Australian green tree frog by the preservative and appeared blue. The color of the frog is caused by blue and green pigments covered in a yellow layer; the preservative destroyed the yellow layer and left the frog with a blue appearance. The specific epithet, "caerulea", which is Latin for blue, has remained. This frog is sometimes referred to as "Pelodryas caerulea" in the scientific literature. In Australia, the frog is also known more simply as the "green tree frog", but that name is often given to the most common green arboreal species in a region, such as the American green tree frog ("Hyla cinerea").