Short Answer
Terp sauce is the terpene-rich liquid layer that separates from crystallized THCA inside a cannabis extract. You make it by running a cold hydrocarbon blend through cured flower in a closed-loop system, purging the solvent under vacuum, then letting the oil rest in a sealed jar at sub-zero temperatures until crystals form. The clear liquid above the crystals is the terp sauce. A solventless version uses a rosin press and a heated centrifuge or press to push the terpene fraction away from the solids. Both routes require lab gear, temperature control, and a licensed space. Open blasting with a tube and a can of butane is illegal in most US states and has caused fatal explosions.
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Prerequisites
- Cured flower or trim, 50 to 100 grams
- Closed-loop extractor loaded with a butane and propane blend, or a rosin press for the solventless route
- Vacuum oven and pump rated for solvent recovery
- Freezer that holds minus 20 F or colder
- Borosilicate jars, chilled glass syringes, 25 micron screens, and a lab scale
- Nitrile gloves, splash goggles, and a respirator with organic vapor cartridges
- Explosion-proof ventilation and a room with no ignition sources
Step-by-Step
- Pack the extraction column with dried flower and tamp it to even density.
- Chill the column and the solvent blend to minus 20 F.
- Run the cold solvent through the column and collect the solution in the receiving vessel.
- Recover the solvent under vacuum and stop when the oil quits bubbling at low heat.
- Move the oil into a sealed borosilicate jar.
- Warm the jar to 90 to 100 F for a few hours to homogenize the extract.
- Store the jar at minus 20 F for five to ten days so THCA crystals grow.
- Draw the liquid layer off the crystal mass with a chilled glass syringe.
- Filter that liquid through a 25 micron screen into a clean jar.
- Cap the jar and keep it in the dark at 60 to 70 F.
Solventless Route
Press flower or hash at 150 to 180 F, collect the rosin, and seal it in a jar. Warm the jar to 100 F until the rosin pools and the THCA grains settle. Separate the top liquid with a syringe, then filter it. Yields run lower than hydrocarbon runs, but no solvent purge is needed.
Common Problems
No separation
The extract is too warm or too thin. Drop the storage temperature and give it more time.
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Cloudy sauce
Fine plant waxes passed through the column. Re-filter at a colder temperature.
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Weak aroma
Terpenes boiled off during purge. Lower the vacuum oven temperature and shorten the purge.
Safety
Hydrocarbon extraction concentrates flammable vapor in a closed loop. Every fitting must be leak tested before a run, and the room needs a gas sensor, bonding and grounding, and a rated fire extinguisher. Work under state-licensed rules and local fire code. Terp sauce holds a high terpene load, so store it away from heat and light and keep the lid tight.