How close have you come to blackout?

[xX-SiLeNcE-Xx]

In a Bi-plane I was in training just trying to black-out/Red-out. The closest I got to black was when the entire screen turned black, except for a tiny circle in the center (6" or so) was super dark.

For redout I used the comet, and did inverted loops until I hit the ground. It got so red, I could barely judge height, but I never actualy fully redded out.