tNatural dye extracted from mangrove bark was applied to a silk fabric by an exhaustion dyeing pro-cess. Aluminum potassium sulfate, ferrous sulfate, copper sulfate, and stannous chloride were used asmordants. The dyeing was conducted with and without metallic salt mordants, using three differentmordanting methods: pre-mordanting, meta-mordanting, and post-mordanting. The color of each dyedmaterial was investigated in terms of the CIELAB (L*, a* and b*) and K/S values. The color fastness towashing, crocking, perspiration, and water of the dyed samples was determined according to AATCC testmethods, whereas the color fastness to light was tested according to the ISO standard. Optimum resultswere achieved when dyeing at 90◦C for 60 min and at pH 3. Silk fabric dyed without mordant had ashade of reddish-brown, while those mordanted with stannous chloride, aluminum potassium sulfate,and copper sulfate produced a variety of pale to dark reddish-brown color shades. However, duller anddarker shade was obtained with ferrous sulfate mordant. The color fastness to washing was mostly verypoor to poor but there was no fading of the color, whereas the color fastness to light and crocking weremostly fair to good level. However, the perspiration and water fastness results showed good to very goodlevels, except for fabric mordanted with ferrous sulfate, whose color change rating was poor to fair forperspiration fastness. Tensile strength, tearing strength and stiffness of the fabrics before and after dyeingwere also evaluated.