yellowness index meaning in English

泛黄指数
黄度指数

Standard test method for polyurethane raw materials : instrumental measurement of tristimulus cielab color and yellowness index of liquids
聚氨酯原材料的标准试验方法:液体三色cielab颜色和黄色指数的仪器测量
Methods of testing plastics - optical and colour properties , weathering - determination of yellowness index - determination of the colour of near - white or near - colourless materials
塑料的试验方法.风化下光学和颜色性能.黄色指数测定.近似白色或近似无色材料的测定