Han, L.N.G., Hanh, L.T.M., Huy, H.H., Hoa, P.T.N., Hien, N.K. and Quang, D.T. 2018. Research on production of some natural food colorings. Hue University Journal of Science: Natural Science. 127, 1D (Dec. 2018), 23-36. DOI:https://doi.org/10.26459/hueuni-jns.v127i1D.5042.