18% grey is NOT used to set white balance. I misrepresented myself in the above posts. It’s used to set exposure. Grass (deep green, not dry dead stuff), sky and a host of other things can be subbed to set exposure when the camera is in the monotone profile because it WILL register very close to 18% grey. I know you might not understand the reasoning, but it’s what I was taught by my instructor, and it’s what I use when I DON’T have the card.