TAPPI T 1216 sp-18仅涉及专门适用于白色的简化颜色索引。大约有5000种可分辨的白色。与任何其他颜色一样，三个数字是完全识别任何白色所必需的。颜色规格中经常使用的所有颜色和色差刻度都适用于白色。

TAPPI T 1216 sp-18 deals only with simplified color indices applicable specifically to white colors. There are approximately 5000 distinguishable white colors. As with any other color, three numbers are necessary for the complete identification of any white. All the color and color difference scales regularly used for color specification are applicable to white colors.