At the end of the 2012 growing season, I allowed suckers from a number of varieties to be frosted. Before any sun was allowed to shine on them, I harvested them and hung them in the shed. Most of these developed a dark, oily brown (almost translucent) character. Very little showed any sign of green. They were kept in the shed through the winter.
Early in the following summer, the frosted leaf was kilned for 1 month. The final result was a deep brown, still somewhat oily looking leaf that made an acceptable component in a pipe blend. It wasn't bad, but it was not good enough for the labor required.
Presently, I have medium size suckers of Vuelta Abajo, PA Red and Olor still standing. I'm expecting a hard frost over the next day or so. I'll give the 3 days of sunshine a try.
Bob