Large effect pigments, due to their strongly specular reflectance, produce a special visual texture known as sparkle. The use of these pigments in many industries (automotive, cosmetic, paper, architecture...) makes the control of this visual texture necessary. A measurement scale has to be developed, so that traceability can be provided by national metrology institutes (NMI) or designated institutes. Some of them (PTB, METAS, CMI and CSIC) have tested their existing capabilities to measure sparkle, and their results are presented. Two possible sources of systematic errors have been identified: inadequate illumination and collection full-angles, and inadequate size of the virtual aperture used to assess the luminous flux reflected on the effect pigments. The measurement scale of sparkle used in this comparison is thoroughly presented. This comparison will allow the methodology to measure sparkle to be improved.

中文翻译：

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深入了解国家计量机构目前测量闪光的能力

大效果颜料，由于其强烈的镜面反射，产生一种特殊的视觉纹理，称为闪光。在许多行业（汽车、化妆品、纸张、建筑……）中使用这些颜料使得对这种视觉纹理的控制变得必要。必须开发测量尺度，以便国家计量机构 (NMI) 或指定机构可以提供可追溯性。其中一些（PTB、METAS、CMI 和 CSIC）已经测试了他们现有的测量闪光的能力，并展示了他们的结果。已经确定了两种可能的系统误差来源：照明和收集全角不足，以及用于评估效应颜料上反射的光通量的虚拟孔径尺寸不足。本次比较中所使用的闪光度的测量尺度被彻底呈现。