本机适用鞋用白色或浅色帮材和底材制品在紫外光照射下耐黄变程度的试验方法。根据浅色或白色制品在紫外光长时间照射下易发生颜色变黄的现象，以紫外光照射试样，在规定时间内，观测试样表面颜色放生的变化，确定试样的变色程度，从而判定试样在紫外光辐射下耐黄变的能力。 This machine is designed for determining the discoloration of white or light color upper materials or sole materials exposed to light with a specified wavelength. Due to light color and white materials or products are easy to change their colors, so test is made underdifferent lights based on this principle. This machine is equipped with a specimen turntable, which can ensure the specimen to expose to light uniformly so that the test precision can be imp