blackening
/ˈblækənɪŋ/noun [抽象名词] [天]变黑；黑度；致黑；黑色涂料
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。
verb [vt. 及物动词] [天]变黑；使变黑；诋毁（blacken 的 ing 形式）
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。
