Actually the bark was one year old, then it sat as alkaline sludge for three years after 3 naphtha pulls. Then crystals were picked off from around the mouth(s) of the jar(s) and subjected to the procedures described in the thread. So 7 years!

The limonene pull described in one of my other threads was also from this batch. Don't know how much bark was used to start with but, in total, near enough another gram of something has been recovered from it, 6 years later!