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Rambutan ( Nephelium lappaceum L ) peel contain anthocyanin and flavonoid compounds which can be used as natural dyes of fabric. this research aims to study the producing of natural dye stock solution extracted from rambutan’s peel ( Nephelium lappaceum L ) with adding of some preservative substancs and evaluating its colour fastness properties on cotton fiber. Preparation of natural dye solution of rambutan fruit was made with concentration of extract at 25% (w/v) and some substances used as a preservative (citric acid, sodium benzoate,benzoic acid, potassium sorbate and tamarind) at various concentration (1%, 3%, and 5%).. Extraction of natural dye from  Nephelium lappaceum L  peel’s waste was performed using maceration method with water as a solvent. The extracts were stored in a closed container at ambient temperature for 3 months, then tested the color fastness parameters of each sample. It is recommended that the use of sodium benzoat and citric acid are the best preservative to produce natural dye stock solution extracted from rambutan’s peel ( Nephelium lappaceum L ) with good result.

journal of physics. conference series

Formulation of Natural Dye Stock Solution Extracted from Rambutan’s Peel (Nephelium lappaceum L) and Evaluation of its Colour Fastness Properties on Cotton Fabric