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Combination of gambier liquid waste and secang wood (Caesalpinea sappan L.) can add color variations of fabric dyed with natural dyes. This research explained the effect of dyeing combination of gambir liquid waste and secang wood with different mordant method and type on the color shade and other characteristics of rayon and cotton dyed fabric. The mordant process was performed as much as 1 and 2 times using CaO, Al(2SO4)3, FeSO4 mordant and then compared without mordant treatment. The result of the dyed fabrics was evaluated the color shade, color strength (K/S), and fastness properties. The results showed that the color shade of rayon and cotton fabrics were varied. Rayon fibers had a greater affinity and absorption to the liquids waste of gambier and secang wood than in cellulose fibers. The mordant process could increase color strength (K/S) and color fastness to washing, acidic perspiration, rubbing, and light.ABSTRAKKombinasi limbah cair gambir dan kayu secang (Caesalpinea sappan L.) dapat menambah variasi warna kain yang dicelup dengan pewarna alami. Penelitian ini menjelaskan tentang efek pewarnaan kombinasi limbah cair gambir dan kayu secang dengan metoda dan jenis mordan yang berbeda terhadap arah warna dan karakteristik lainnnya dari kain rayon dan katun hasil celupan. Proses mordan yang digunakan adalah 1 kali dan 2 kali mordan menggunakan CaO, Al(2SO4)3, FeSO4 yang dibandingkan dengan tanpa mordan. Kain hasil pewarnaan dievaluasi arah warna, intensitas warna (K/S), dan ketahanan luntur warna. Hasil penelitian menunjukkan arah warna kain rayon dan katun yang lebih bervariasi. Serat rayon memiliki afinitas dan penyerapan yang lebih besar terhadap zat warna limbah cair gambir dan kayu secang dibandingkan dengan serat selulosa. Proses mordan dapat meningkatkan intensitas warna (K/S) dan ketahanan luntur warna terhadap pencucian, keringat asam, gosokan, dan sinar.

Gambier liquid waste is a by-product from gambier (Uncaria gambier Roxb.) processing plant, which is still contains a lot of untapped tannin. This waste could be used for textile dyes, but it is easily damaged during storage. So, the aim of this research is to treat gambier liquid waste so it could be used as silk dye. This research was carried out by concentrating the waste and using stabilizers such as lime (K), alum (T), lotus (F). The parameters tested include pH and fungal growth for up to three months. The results of the process could generate several different colors which is brownish red, brownish yellow and dark green. The waste could save more than 3 months. The color of the waste generated depends on stabilizer type and pH. The use waste on silk produced brownish red color, golden yellow and moss green to dark green.