Natural Dye Extraction From Teak Leves (Tectona Grandis) Using Ultrasound Assisted Extraction Method for Dyeing on Cotton FabricLailatul Qadariyah, Mahfud Mahfud, Endah Sulistiawati and Prima SwastikaMATEC Web Conf., 156 (2018) 05004DOI: https://doi.org/10.1051/matecconf/201815605004