Chemical Modifications for Intensity Variation and Spectrum Extension of Brazilein Extract from Sappanwood (Caesalpinia sappan L.)Edia Rahayuningsih, Wiratni Budhijanto, Hana Fitria Prasasti and Meyta Tias WahyuningrumMATEC Web Conf., 156 (2018) 01020DOI: https://doi.org/10.1051/matecconf/201815601020