Mahltig B. Overview on natural dyes and their IR-spectra – Part I: Plant based dyes with naphthoquinone and anthraquinone structure. cdatp [Internet]. 2024 Apr. 7 [cited 2024 May 17];5(1):20-37. Available from: https://cdatp.journals.qucosa.de/cdatp/article/view/125