I did the tests. Came out really close, close enough for me and I'm picky. But now on the real subject it's giving me issues. That's what happens when the test pc is 8" and the real thing is 12'
Time becomes a big issue. I was using a countdown timer. I have to put the orange on and wipe it off and immediately put the brown on top and let it sit for 2 1/2 minutes. Because of the immediate factor I've been doing about 2' of orange and wiping it off and then putting the brown on top moving back and forth between the orange and brown. All the while the 2 1/2 minutes is counting down. I got a little farther than 1/2 way when the timer went off and had to start wiping. But you have to do only to 1st area, put more orange on the other end then brown, come back and wipe the next session that reached 2 1/2 minutes etc. Whatta pain in the butt. Timing is way to sensitive on this stain.