Dyes from morinda lucida :

Abstract

The study Investigated the effects of different mordanting methods and dyeing time on silk and cotton fabric colorations from the bark of Morinda lucida. The effects are analyzed with respect to color fastness to; light, washing wet and dry rubbing and characteristics on CIELab color coordinates. The aqueous extraction method was used to extract the dye. Alum and ferrous- sulphate mordants were used for dyeing. The mordanting methods used include: pre-mordanting, simultaneous mordanting and post-mordanting the control dyeing without the use of mordants, moderate to good fastness were registered with the following fastness ratings; for washing (2-3), dry rubbing (4), wet rubbing (3-4) and light (4) for silk fabrics and for washing dry rubbing (3), wet rubbing (3) and light (4) for cotton fabrics. The natural dye is therefore an adjective dye since it is poor without mordants. The use of mordant improved color fastness to light from ratings of (5) to (6) for most mordants with simultaneous method premordanting methods exhibiting the best results on silk and cotton fabrics respectively. Multiple colors were produced with different mordants therefore the leaves possess polygenetic dye. Premordanting method registered the best color strength in terms of color difference value and it exhibited the best color saturation value C. In all cases premordanting method gave the best color characteristics with the most brilliant colors on fabrics and good color fastness with all mordants. However, there was no observable effect of mordanting methods on the yellowness or greenness of color.