让我们库克为一个半小时，所以将黑色涂层厚度。
Let it cook for a half an hour, so the black coating will be thick.
BPA被用在热敏纸的表面涂层中，这种热敏纸和染料发生反应从而显示黑色字迹的收据每天在数以百万的美国人手中传递着。
BPA is used to coat thermal paper, which reacts with dye to form black print on receipts handled by millions of Americans every day.
同涂层遮盖力相关的一个数值，以相同的涂层的厚度在黑色和白色背景下涂层反射系数的比值。
A value related to the hiding power of a coating. The ratio of reflectance of the coating over black and white backgrounds at equal film thickness.
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