Study of Colour Measurements of Leather Dyed with Walnut Bark Natural Dye: Walnut Bark Dyed Leather. Biological Sciences - PJSIR, [S. l.], v. 53, n. 5, p. 252–257, 2010. Disponível em: https://v2.pjsir.org/index.php/biological-sciences/article/view/473. Acesso em: 10 mar. 2026.