<![CDATA[This study examined the effect of tegeran wood (Cudrania javanensis) extract concentration on color absorption and color fastness of cotton fabric. A controlled quantitative experiment used five concentration levels (20%, 40%, 60%, 80%, and 100%). Twenty-five cotton specimens were prepared; however, identical visual scores within each concentration produced five effective observation points for statistical analysis. Dyeing was conducted by three multi-dipping cycles at 28–30 °C and neutral pH. Color absorption, washing fastness, and dry-rubbing fastness were rated on a 1–5 visual scale. Simple linear regression showed significant positive effects on color absorption (r=0.971; R²=0.942; p=0.006) and washing fastness (r=0.945; R²=0.893; p=0.015). Dry-rubbing scores increased perfectly with concentration in this limited dataset (R²=1.000), requiring cautious interpretation. The 100% concentration produced the highest overall scores and an intense golden-yellow appearance.]]>
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