// Definition
A preservation technique using a freeze dryer to remove moisture from bubble hash through sublimation — the direct transition of water from ice to vapour under vacuum. This preserves terpenes and prevents the oxidation, mould risk, and terpene loss that occur during traditional multi-day air drying on cardboard or in pizza boxes.
// From the Episode
Multiple participants discussed the Harvest Right home freeze dryer as a breakthrough tool for bubble hash producers. Mark Scialdone provided the scientific explanation: when frozen material is placed under vacuum, ice sublimes directly to vapour without passing through the liquid phase, preserving the structural integrity and volatile terpene content of the hash. The connection to fresh-frozen processing was also discussed.