Sombut, V. ., Ohama, P. ., Kumpun, S. ., Kulnides, N. . and Yingyongnarongkul, B.- ek . (2022) “Separation of Blue Ballpoint Pen Inks- A Comparison of Solvent Systems on Thin Layer Chromatography Techniques”, Suan Sunandha Science and Technology Journal. Bangkok, Thailand, 5(1), pp. 20–27. Available at: https://li02.tci-thaijo.org/index.php/ssstj/article/view/331 (Accessed: 3 May 2024).