The color of ternary Au-Ag-Cu alloys is investigated; a simple and efficient model relying only on the reflectance of gold, silver, and copper is suggested. The alloy color diagram (a⋆,b⋆) based on the alloy proportion (u, v) has the shape of a “wizard’s hat” with special properties. Leuser’s classical triangle can be improved upon these results.

中文翻译：

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五十度黄

三元Au-Ag-Cu合金的颜色研究；建议使用仅依赖金、银和铜反射率的简单有效模型。基于合金比例（u，v）的合金颜色图（a⋆，b⋆）具有特殊属性的“巫师帽”形状。根据这些结果，可以改进 Leuser 的经典三角形。