The color of oud oil is one of the most reliable indicators of its quality and purity. High-grade oud oil is distinguished by its rich yellow to golden hue, a visual testament to its superior extraction and refinement process. This golden color reflects a high concentration of pure resin, minimal impurities, and careful, traditional distillation—often from aged and naturally infected Aquilaria heartwood. In contrast, lower-quality oud oils tend to appear dark brown or black, signaling the presence of impurities, additives, or inferior raw materials. As such, the golden tone of premium oud oil is not just aesthetic but a key marker of its authenticity, rarity, and exceptional aromatic depth prized in fine perfumery and traditional practices.