Hello Birdman
That is the first time I have heard of that method. I will keep that in my note book
I have used carbon transfer paper before and it worked really well. I got the carbon paper from a local stationary store cut sheet into squares the size of the tyre footprint. I then jacked the car up and lowered it onto the carbon paper with a white paper sheet as the backing to transfer the print. Once I removed it the tyre footprint and pressure points were clearly visible.
Best of luck.