How does turning something dark make it invisible? Only in darkness would that work as invisibility. And then you don’t need it.
Light comes to an object and light leaves an object to be sensed by receptors. If you can bend light to prevent it leaving, you can bend light to make it show what is behind an object rather than revealing the object. In a night sky, prevenmting electromagnetic reflection makes something disappear as it flies over, except for blotting out star background.