To reduce the negative impact caused by synthetic dyes, development and exploration are carried out with the use of Siam weeds (Eupatorium odoratum L) as an alternative. It has main component such as tannin, phenol, flavonoids, saponins and steroid. The method in the study used a quasi – experimental design with a control group research design with descriptive analysis. To make the color solutions by hot extraction, pre-mordant using alum was carried out in 15 times. The post mordanting process used 3 types of mordant; alum, quicklime, and tunjung. Organoleptic test used to test the contrast, the suitability of the dyeing result, and the color of eco-print motif using the pounding technique. The result showed that Siam weed can be used as natural dyes for textile. The color direction of dyeing with mordant alum fixation produced a dawn blue, quicklime produced silver cloud, and tunjung produced dusty olive. While the color result of eco-print on alum fixation was tea color, quicklime was mistletoe and olive branch, and tunjung was deep lichen green. The dark color result on the tunjung fixation and the lightness color on alum fixation.
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