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It sounds like you're referring to a 20-gram packet of permanent black fabric dye designed for clothes. Here's what you should know about using it:Key Features:Permanent Dye: Designed to last through multiple washes without significant fading.Black Colour: Ideal for refreshing faded black clothes or dyeing lighter fabrics black.20g Size: Typically sufficient for dyeing around 250g–500g of fabric, depending on fabric type and desired intensity.How to Use:Prep the Fabric: Wash it to remove any dirt or finishes.Dissolve the Dye: Mix the dye powder in hot water (check the product instructions).Add Fixative (if required): Some dyes need salt or soda ash to help set the color.Soak Fabric: Immerse fabric in the dye bath for 30–60 minutes, stirring continuously for even color.Rinse & Dry: Rinse in cold water until it runs clear, then wash and dry as usual.Things to Check:Fabric Compatibility: Works best on natural fibers like cotton, linen, rayon, or silk.Brand Instructions: Always follow the specific dye brand’s directions.Colorfastness: Test on a small swatch if you're unsure.