The color change of Grayscale mode is immediate and all saturation will be removed, changing the visible screen to shades of gray into what is basically black and white. Under the ‘VISION’ section, locate “Grayscale” and toggle the switch to the ON position.Go to “General” and then followed by “Accessibility”.Turning on grayscale mode is simple through the Accessibility settings on iPhone or iPad: How to Turn On Grayscale Color Mode in iOS

We’ll also show you how to turn off grayscale mode if you no longer want the iOS screen to be black and white, to return your iPhone or iPad display to full color. This effectively lets you run your iOS device in black and white. This tutorial will show you how to turn your iPhone or iPad display into grayscale mode, stripping away all color from the screen.