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AboutTo cold cure rosin, scrape it fresh off the press into a glass jar, seal it and leave it somewhere cool, about 40 to 70 °F, for one to three days, sometimes up to a week, stirring now and then. It turns into a stable, creamy badder. Warm curing, at about 90 to 135 °F, turns rosin into jam or sauce instead.
What is cold cure rosin?
Cold cure rosin is rosin left to cure in a sealed jar at cool temperatures until it nucleates: tiny crystals form around fats and other compounds in the rosin, and the rest of it builds on them until the whole jar turns opaque and creamy. Hash makers say the rosin “butters out.” The cure changes how it looks and handles, not how strong it is.
How to cold cure rosin
How to cold cure rosin, step by step:
- Press straight into the jar.
Collect fresh rosin into a clean glass jar as soon as it comes off the parchment.
- Seal it.
Close the jar right away to keep the terpenes in and the air out.
- Keep it cool.
Leave it at about 40 to 70 °F. A cool room works, and so does the fridge.
- Wait one to three days.
Check it every day. Most rosin turns in 24 to 72 hours; some takes up to a week.
- Stir it.
If the terpenes start to separate, open the jar, stir them back in and reseal. Some makers whip it to make the texture even.
- Store it cold.
Once it has the texture you want, keep it sealed in glass, cold and dark.
Cold cure vs warm cure
Cold cure vs warm cure comes down to heat, and heat decides the texture:
| Cold cure | Warm cure | |
|---|---|---|
| Temperature | About 40 to 70 °F | About 90 to 135 °F |
| Time | One to three days, up to a week | A few hours to a few days |
| Texture | Creamy badder | Jam, sauce or diamonds |
| Terpenes | Best preserved | Some lost to the heat |
| Used most with | Hash rosin and flower rosin | Bubble hash and dry sift rosin |
Cold cure hash rosin
Cold cure hash rosin is the pick when you want the terpenes kept and a creamy badder. Low Temp says cold curing, the most common method, is typically used with solventless hash rosin or flower rosin, and The Press Club finds both respond well to it. The Press Club also says hash rosin takes well to a warm cure when the goal is jam or diamonds in sauce. Either way, start with the best hash rosin you have, because the depth of flavor a cure brings out depends on the starting material.
Warm cure rosin and rosin jam
Warm cure rosin is cured at about 90 to 135 °F, often on a heating pad set around 100 °F. The heat lets the THC crystallize and crash out of the terpenes, so the jar separates into sugary crystals swimming in sauce, which is what rosin jam is. It looks spectacular and keeps well at room temperature, at the cost of some of the most volatile terpenes.
Cold cure live rosin
Cold cure live rosin is the way most live rosin is sold, because the wet, creamy badder holds its texture on the shelf and keeps the terpenes that make it live. Fresh press live rosin, jarred straight off the press without a cure, keeps every volatile note but changes quickly unless it stays cold; cold cured live rosin is creamier and more stable. More on how it’s made in live rosin.
Curing rosin is not aging it
Curing rosin is not aging it. The cure takes days; after that, rosin wants to stay fresh and cold. Bubbleman is blunt about the difference: high-end rosin doesn’t age well, turning orange and growing a skin, and badly aged rosin starts to smell and taste like carrots. Traditional hash is the one that gets better with time.
From the archive: Bubbleman on rosin and age
From the archive, Bubbleman on rosin and age in his own words, from two live Sunday shows. Tap a time to hear that moment.
Generally, rosin, high-end rosin, does not cure well. We don’t want that skin on our rosin. We don’t want that orange color. That’s what it does when it cures. We want it fresh, pressed… in the cold chain, like pulling snap.
On keeping rosin fresh
He brought me a bunch of different dabs, and unfortunately, a ton of them smelt and tasted like carrots, i.e., he aged it poorly… It’s not fresh, good, new rosin.
On rosin that aged badly
Rosin curing questions
Rosin curing questions, answered short:
What is cold cure rosin?
Cold cure rosin is rosin sealed in a jar right after pressing and kept cool for a few days, until it turns into a creamy, stable badder.
How long does it take to cold cure rosin?
Cold curing rosin takes about one to three days, sometimes up to a week, at about 40 to 70 °F.
What is the difference between cold cure and warm cure?
The difference between cold cure and warm cure is heat: cold cure stays at about 40 to 70 °F and makes badder, while warm cure runs at about 90 to 135 °F and makes jam or sauce.
Does cold curing make rosin stronger?
No, cold curing doesn’t make rosin stronger. It changes the texture and makes the rosin more stable at room temperature.
Is cold cure better than fresh press?
Cold cure isn’t better than fresh press, just different: fresh press keeps the most volatile terpenes but changes quickly, while cold cure is creamier and more stable.
Sources for this rosin curing guide
Sources for this rosin curing guide:
- Cold curing vs warm curing rosin, The Press Club
- How to cure rosin: cold curing vs heat curing, Low Temp Industries
- How to make rosin jam, Low Temp Industries
- What is nucleation in rosin?, The Press Club
- How to properly store rosin, The Press Club
- Hash Church Season 12, Episodes 17 and 24: Bubbleman on rosin and age, linked above