Okoye IF, Alaekwe IO, Abba O. UV-VIS SPECTROPHOTOMETER ANALYSIS OF FILM GROWN USING NATURAL DYE FROM LAWSONIA INERMIS (HENNA PLANT). NJP. 2021;30(2):135-139. Accessed August 21, 2025. https://njp.nipngr.org/index.php/njp/article/view/104