What is the WPFF hash?

There are different ways to prepare cannabis for ice water extraction, the results of which are called bubble hash.

What is Whole Plant Fresh Frozen (WPFF)?

Traditionally, hashish makers would hang cannabis upside down to dry it completely before extracting the resin. Drying cannabis flowers, then storing them in glass jars, is the same preparation for consuming them whole. But throughout this process, exposure to the open air - even inside an environmentally controlled drying room - leads to a loss of terpenes and progressive oxidation.

There is another way to prepare cannabis just after harvesting, which minimizes oxidation and preserves the abundance of terpenes locked in the trichomes of the plant. This method uses freshly cut and immediately frozen cannabis plants, so that growers harvest both the flowers and the trichome-rich «cutting leaves» (the sugar trim).

This form of starting material is called Whole Plant Fresh Frozen, or WPFF for short. With access to a commercial freezer capable of reaching temperatures below -20°C, growers and extractors can preserve many of the characteristics of the living cannabis plant and pass them on to the ice water hash extracted from it.

An example of a WPFF hash found on Reddit. It was made with trichomes of size 45 -159u, was flash frozen and pressed by hand (finger hash) + 3 months of curing.

How is WPFF hash made?

The production of WPFF hash is based on the principle of ice water extraction (ice water extraction), applied to fresh-frozen starting material. Here are the main steps in the process:

1. Harvest and freeze immediately As soon as the plants are cut, they are placed in airtight bags and quickly frozen (flash frozen) at a temperature below -20°C, ideally within minutes of cutting. The aim is to stop enzymatic degradation and oxidation in their tracks.
2. Preparing the ice bath The frozen material is immersed in a vat of very cold water and ice. The trichomes, made fragile by the cold, detach easily from the flowers and trim when gently shaken.
3. Sieve filtration The water/ice/trichome mixture is filtered through a series of sieve bags of different sizes (generally from 25 to 220 microns). Each mesh size retains a different fraction of trichomes. Fractions between 73 and 120 microns are generally the most prized for their purity.
4. Hash drying hash: the recovered hash is spread out on trays and dried cold, often in cold rooms or with air conditioning, to avoid thermal degradation. High-quality drying is essential to obtain a stable product that is not subject to mould.
5. Curing optional Some extractors use a refining process (curing) for several weeks to several months under controlled conditions. This stage enables the hash to fully develop its terpene profile and refine its texture.

WPFF vs dried cannabis: what's the difference?

The choice of starting material has a direct and major impact on the quality of the hash produced.

Immediate freezing preserves the terpene profile of the living plant, which explains why WPFF hash is considered the pinnacle of ice-water extraction. On the other hand, it requires rigorous refrigeration logistics and an adapted infrastructure, beyond the reach of small-scale producers.

Live hash rosin from WPFF

Rosin pressed from hash made with WPFF is called live hash rosin. The term «live» (living) is a direct reference to the freshness of the starting material, as opposed to extractions from dried and cured cannabis.

Live hash rosin is now considered one of the most premium concentrations of cannabis available on the legal market. Its entirely solvent-free manufacturing process - water + pressure + cold - also makes it a popular product with consumers keen to avoid chemical residues.

In practice, only hash obtained from the best trichome fractions (full melt, rated 5-6 stars) is pressed into live hash rosin. Less pure fractions are marketed as such or used in other preparations.

How do you recognize a quality WPFF hash?

Quality WPFF hash is distinguished by several organoleptic and technical criteria:

• The color Fresh WPFF hash should be light in color - white, beige or slightly golden. Too dark a color betrays oxidation or poorly controlled drying.
• The aroma The olfactory profile must be lively, complex and faithful to the original variety. A good WPFF can often be recognized by its pronounced floral and terpenoid scent.
• The texture Depending on the degree of purity and curing, the texture can range from crumbly sandy to slightly oily. A hash that melts completely in the heat (full melt) is a sign of maximum trichome purity.
• Star rating In the extractor community, bubble hashes are rated from 1 to 6 stars, depending on their purity. A WPFF hash generally aims for 4 to 6 stars. The full melt (5-6 stars) melts completely without residue, indicating an almost pure trichome fraction.

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