STORAGE

How should I store my hash? 

How you store your hash depends on your desired outcome. Hash and rosin are complex substances with various attributes to preserve or enhance. While I can't provide a universal storage solution, I can explain storage factors and potential outcomes to consider when selecting a storage solution.

If I am trying to preserve my product as it was when packaged, I will select a zero headspace or inert headspace environment and a temperature that promotes the material remaining in its current state. Cold temperatures decrease solubility and promote separation. Additionally, they slow down chemical reactions. Warmer temperatures accelerate molecular movement, influencing texture, and increasing solubility. Finding the ideal temperature balance to maintain specific textures is crucial. Due to the complex and varied nature of hash and rosin, custom storage solutions may be necessary.

What is headspace?  

Headspace is the area above your material inside the container.  If there is head space not occupied by gases from the volatiles that head space will continue to fill up with gases from the volatiles until that space is saturated.  Once that space is fully occupied volatiles will stay in the matrix.  When you open the container those molecules go into the surrounding air and when the container is capped more volatiles can enter that head space.  Each time the container is opened it promotes more volatile loss.  Reducing the headspace in the container will help retain volatiles in your hash or rosin.

I have head space in my container, can I adjust the humidity to protect the volatiles?  

Short answer, yes: water vapor acts like a traffic jam for volatiles. Raising humidity or water activity (aw) around hash slows the diffusion, evaporation, of terpenes and other VOCs.  Terpenes are lost mainly by gas-phase diffusion.  High humidity does two things: thickens the boundary layer at the surface, and reduces effective diffusion coefficients for terpenes in air, resulting in slower terpene escape.  Water vapor displaces terpene partial pressure, in dry air there is "room” for terpene molecules.  In humid air, water vapor occupies a large fraction of the gas phase, partial pressure available for terpenes is reduced, and they escape more slowly.  

At moderate aw around 0.55–0.65, trichome resin is less brittle, the gland wall lipids stays plasticized.  At this water activity range terpenes remain more strongly partitioned into the resin.  At very low aw <0.3, the resin becomes glassy, micro-fractures form, and terpenes escape faster.  

There is a sweet spot, above 0.7 aw, there is microbial growth risk, enzymatic activity increases, and terpene loss occurs via biochemical pathways.  

What is the best humidity range or water activity range for perserving volatiles in the matrix?  

The optimal terpene retention zone is aw around 0.55–0.62 or RH around 58–62% (equilibrated).  Keep the temp cool and the oxygen minimized.  

What about natural cellulose/natural cellophane sheets to age or store hashish?

To understand the difference between natural cellophane and “non-biodegradable cellophane,” it helps to clear up a common source of industry confusion: true cellophane is a regenerated cellulose film derived from plant material and is generally biodegradable. When people refer to “non-biodegradable cellophane,” they are often describing either a petroleum-based plastic film made to resemble cellophane, or cellulose-based cellophane that has been coated or laminated with synthetic barrier materials that reduce or prevent compostability. Here is how these materials differ, what drives degradation, and how coatings affect performance.  Natural vs. “Non-Biodegradable” Cellophane:  The word “cellophane” is often used generically to describe clear, crinkly packaging film, but it can refer to fundamentally different materials. Natural Cellophane (True Cellophane) vs. “Non-Biodegradable Cellophane” (Plastic Substitutes or Laminates).  Regenerated cellulose from wood pulp, cotton linters, or other plant fibers.  Typically BOPP (biaxially oriented polypropylene), PET, or cellulose laminated with plastic.  Chemical Structure: Natural polysaccharide polymer of glucose units: (\text{C}6\text{H}{10}\text{O}_5)_n, Synthetic hydrocarbon polymer chains such as polypropylene or polyester.  Generally natural cellulose is biodegradable and often compostable depending on coatings, additives, and disposal conditions Typically non-biodegradable or only partially degradable; may persist as plastic residue.

What makes cellophane degrade?

Because true cellophane is cellulose-based, its breakdown process is similar to paper or cotton. Degradation occurs through a combination of moisture, microbial activity, and environmental exposure.  Cellophane contains both crystalline and amorphous cellulose regions. Water penetrates the less ordered amorphous regions first, causing the film to swell and become more accessible to microorganisms.  Bacteria and fungi then produce cellulase enzymes, which break down the cellulose by hydrolyzing the β-1,4-glycosidic bonds between glucose units. This reduces the cellulose polymer into: short-chain oligosaccharides, cellobiose, individual glucose molecules. These glucose molecules are then consumed by microorganisms as an energy source.  Breakdown also occurs from environmental degradation such as, moisture.  Water weakens the hydrogen bonding between cellulose fibers, softening the film and increasing accessibility to enzymes and microbes.  UV Exposure can also degrade natural cellulose.  Sunlight can trigger photo-oxidative degradation of cellulose, causing chain scission and oxidation of functional groups. This results in yellowing, embrittlement, loss of strength, and eventual fragmentation. Degradation speed depends heavily on, coating type, film thickness, temperature, humidity, oxygen exposure, and microbial activity.  While some uncoated cellulose films can soften or fragment quickly in water, complete biodegradation is highly environment-dependent.

What is cellophane coated with?  Raw cellophane has excellent clarity and gas permeability but relatively poor moisture resistance. To make it practical for food and industrial packaging, manufacturers often apply very thin barrier coatings to improve moisture resistance, aroma retention, and sealability.  Common coatings include, nitrocellulose lacquer, cellulose-derived lacquer traditionally used to improve moisture resistance, it maintains flexibility and transparency, and generally remains compatible with biodegradation, though it may slow the process somewhat.  PVDC (Polyvinylidene Chloride) is a synthetic barrier coating with excellent resistance to oxygen, moisture, and aroma transfer, it is common in food packaging where long shelf life is required and significantly reduces compostability and slows breakdown compared with uncoated cellophane.  Polyethylene (PE) or Petroleum-Based Laminates/Waxes are sometimes added for improved tear strength, heat sealing, or enhanced moisture protection and may create a composite structure where the cellulose core can degrade but the plastic layer persists.  

What is the big take away about cellophane?

If a film is marketed as “cellophane,” that label alone does not confirm it is compostable or plastic-free. The most important distinction is whether the material is, uncoated regenerated cellulose,  coated regenerated cellulose, or plastic film marketed as cellophane.  Uncoated regenerated cellulose advantages: highly breathable,  less likely to trap moisture, minimal synthetic materials in contact with the hash.  The disadvantages of uncoated: Poor moisture barrier, poor aroma barrier, terpenes can slowly diffuse through the film, hash can dry out over time if stored in low-humidity environments. Coated regenerated cellulose advantages: better barrier to oxygen, moisture, and aroma loss, slows terpene evaporation, better protection against environmental humidity swings, generally superior for medium- to long-term storage. The disadvantages of coated cellulose: the coating chemistry matters, some coatings can increase sticking, certain coatings may interact differently with terpene-rich material than bare cellulose, and less breathable. Since suppliers are often unwilling to give the exact composition and chemical makeup, I find using glass is best for my products.  If the hash has  water activity above 5.5 aw, I do not recommend using natural cellulose.