studying the effect of Rhodamine b concentration on the spectral properties. Journal of the College of Basic Education, [S. l.], v. 29, n. 119, p. 21–19, 2023. DOI: 10.35950/cbej.v29i119.10603. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/10603.. Acesso em: 4 jun. 2026.