Samsung Galaxy S6 Edge: How to Enable or Disable Negative Colors in Android 5.1.1 Lollipop

If you often use your Samsung Galaxy S6 Edge in low-light situations(e.g., reading an e-book or a long post in a webpage at night) or are very sensitive with light, you can invert the screen's colors using the negative colors feature so that it'll look like a negative film and be dominated with the dark colors. This will not only be able to make reading easier for your eyes and prevent eye strain