blackening
n. [天]变黑；黑度；致黑；黑色涂料
v. [天]变黑；使变黑；诋毁（blacken 的 ing 形式）
例句
The married women of Shitamachi maintained the custom of blackening their teeth.
下町的已婚妇女保留了染黑牙齿的习俗。
《柯林斯英汉双解大词典》
Quite significantly, there was no blackening of the emulsion at the mirror's surface .
十分引人注意地，在反射镜表面的乳胶没有变黑。
Here's a video to flesh out any curiosities you may have about the blackening of the bride.
这里有一个视频可以把你对把新娘弄黑的好奇具体化。
