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Fiber extracted from castor plant is a bast fiber like hemp, jute, flax and kenaf. Based on the chemical constitutes; physical and chemical properties of these eco-friendly fibers extracted from agro waste are used in making different materials like union fabrics and reinforcement materials. In the present study, castor fiber was dyed with Eclipta prostrata plant extract and evaluated for colorfastness and color strength properties. The colorfastness properties of castor fiber dyed with pre, simultaneous and post-mordanting methods using four mordants aluminum potassium sulfate (commonly called alum) (KAI(SO4)2 .12H2O), stannous Chloride (SnCl2), copper sulfate (CuSO4) and ferrous sulfate (FeSO4) were tested. The colorfastness to light, wash, crock and perspiration was found to be good for CuSO4 and FeSO4 dyed fibers. Color strength properties for the samples were also assessed and found to be good.

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.