It was discussed quite a bit on the old WOFS forum
www.wofs.com/smf/index.php?topic=20904.0
Some Masters say it is not a cure but rather a way to measure or see the harsh #5Yellow (in the East this coming year) at work.
Some say that historically it was used for a 6-7 combination only.
But many people today use it in the sector where the Annual 5 flies.