This study is conducted to explore and utilize fresh mangosteen peel as an upcoming raw material for the production ofnatural dyes. The extract of fresh mangosteen peel is tested on cotton fabric by using alum as a mordanting agent who processed bypre-mordant dyeing procedure and fixation using 3 (three) different types of fixer. To obtain optimum interaction of fabric, mordant,dye and fixer, washing procedure has been performed using Turkish Red Oil (TRO) before the mordanting stage with varyingwashing time and repeated dyeing procedure with varying frequency of dyeing. As a result, the application of pre-mordanting dyeingmethod and fixation using iron (II) sulfate (FeSO4.7H2O), alum (KAI (SO4)2.12H2O) and lime (CaO), produced very good color frommangosteen peel dyes extract. Cotton fabric that has been through the pre-mordanting dyeing procedure using dyes extract ofmangosteen peel consecutively bring green, light brown, and dark brown color each on the fixation result using iron (II) sulfate, alum,and lime. Preliminary evaluation and instrumentation allow us to determine whether the application of washing time varies, therepeated frequency of immersion and the use of different fixers compound using dyes extract with similar concentration and dyeingprocedure affect the color intensity of the fabric sample.
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