The colour components in the roots of the plant Morinda angustifolia Roxb, were isolated and their Structures were elucidated based on chemical and spectroscopic investigations. Further. the dyeing behaviour of the colour component Oil wool in aqueous medium was also evaluated. Depending on concentrations of dye ( 1-5%) in the dye bath, the dye absorption on the fibre varied from 12.50-31.58%. The fastness properties of the dyed yarns were determined. Optical densities (OD) and colour strength (K/S) values of the dye solutions as well as the dyed yarns and also colour co-ordinates for dyed yarns were determined.