Study of the shape and angularity of abrasive particles, vegetable and mineral, to be incorporated into solid soap with exfoliating action: Kaolin, bentonite, rice microspheres, bamboo and apricot seed - Gonçalves, Jumara Aparecida Batista; Pinheiro, Gilmar de Oliveira; Valenzuela Díaz, Francisco Rolando (Principles and concepts for development in nowadays society, 2023)