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Android : Change Display To Black And White

Recently I thought to change my display to Black and White. Before finding the app for the same.
I decided to take a peek at the developer option luckily there is an option to change the display color
i.e "Simulate Color space ".

I am using device Lenovo K4 Note with Android 5.1 running.

Below is the Steps:
Go to Settings > Developer options > Simulate colour space .(Select the color ).

Here is video