2025. PHYSICAL TESTS OF ORGANIC INK BASED ON GUM ARABIC, GAMBIER, AND JANGGELAN LEAVES. Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics. 7, 1 (Jan. 2025), 54–61. DOI:https://doi.org/10.15408/fiziya.v7i1.40521.