The color of mineral pigments changes obviously with their particle size. However, how the particle size of these mineral pigments affects the color of the mineral pigment color block remains unclear. Based on optical principles and the physical properties of mineral pigment particles, our analysis found that changes in the particle size not only nonlinearly affect the behavior of light at the first surface of the mineral pigment color block, but also affect the interaction of light with the particles within the body of the mineral pigment color block, ultimately changing the spectral reflectance and color of the mineral pigment color block. Finally, we derived a nonlinear monotonically decreasing relationship between the particle size and the spectral reflectance. The experiment conducted in this article selected six kinds of mineral pigments as color block samples and observed the changes in the spectral reflectance and color value with the particle size. These studies are beneficial for color researchers conducting scientific research related to mineral pigments.

中文翻译：

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矿物颜料的粒径影响其光谱反射率和颜色的分析

矿物颜料的颜色随其粒径而明显变化。但是，这些矿物颜料的粒径如何影响矿物颜料色块的颜色仍不清楚。根据光学原理和矿物颜料颗粒的物理特性，我们的分析发现，粒径的变化不仅非线性地影响矿物颜料色块第一表面上的光的行为，而且还影响光与颜料颗粒的相互作用。矿物颜料色块体内的颗粒，最终改变了矿物颜料色块的光谱反射率和颜色。最后，我们推导了粒径与光谱反射率之间的非线性单调递减关系。本文进行的实验选择了六种矿物颜料作为色块样品，观察了光谱反射率和色值随粒径的变化。这些研究对于进行与矿物颜料有关的科学研究的色彩研究人员是有益的。