Question

If you stare at a red patch and then look at a red apple, will your experience of the redness of the apple be stronger or weaker?

Answer 1

If you stare at a red patch and then look at a red apple, your experience of the redness of the apple will be  weaker. 
The reason is because staring at red patch fatigues red portion of red-green channel. Hering’s opponent-process model predicts this situation. The theory was first developed by Ewald Hering.

Answer 2

If you stare at a red patch and then look at a red apple, will your experience of the redness of the apple be stronger or weaker?  The experience of the redness of the apple will be weaker because the red apple has different colors throughout it whereas the red patch is the same look throughout.