How to Cure Rosin for Shelf Stability and Perfect Texture

Curing rosin before retail distribution is essential because it makes your extract shelf-stable, flavorful, and perfectly textured into the form of a badder, budder, sauce, or jam. There are two primary rosin curing methods that every solventless extraction professional should consider: cold curing and warm curing. 

Cold Curing vs Warm Curing Rosin

Cold curing and warm curing rosin each comes with pros and cons. 

General guideline when choosing cold curing vs warm curing for rosin: Cold curing techniques are excellent for maximizing the quality of flower rosin, while warm curing results in some amazing transformations to hash rosin. 

Steps for Cold Curing Rosin

Cold curing rosin requires: 

• A sealed glass jar 
• A metal dab tool 

1. Scrape a batch of freshly pressed rosin from the parchment paper after it flows out of the rosin press, using your dab tool. For more information on rosin pressing, refer to our guide on How to Use a Rosin Press. 
2. Place the rosin inside a glass jar, leaving a little room for air at the top. The jar should be no more than 80 percent filled, and it’s important to use glass. Glass has been found to retain the initial volatile-organic-compound profile better than other storage materials. 

2. Seal the jar immediately. You want a strong, airtight seal that will lock in the terpenes. 

3. Place the jar in a cool, dark location. The location should have a consistent temperature between 60 and 70 degrees Fahrenheit. 

5. Examine the sealed jar once every 24 hours to monitor nucleation. You’ll know the rosin curing process is complete when the extract transforms into your desired consistency. The once-translucent sap should achieve a texture that is smooth, creamy, and buttery. You may notice a layer of terpene-rich liquid pooling at the top. The process typically takes between two and seven days, but may take up to two weeks in some cases. 
6. Whip the rosin. Open the jar and stir the rosin thoroughly using your dab tool. Whipping rosin is an optional step, but it can help to smooth out the consistency and distribute the terpenes more evenly. 

6. Store in a refrigerator or freezer. Once the rosin is cured, maximize its longevity by keeping it in a refrigerator or wine cooler. You can even place it in the freezer to maintain its quality for six months to a year. Learn more about storing rosin here.

7. Pay special attention to monoterpenes. Strains rich in aromatic monoterpenes, like limonene, pinene, and myrcene, may lose their aroma more quickly than strains with less volatile terpenes such as beta-caryophyllene and humulene. If your goal with curing is to preserve the aromatic compounds, pay attention to the terpene profile of your starting material. 

Steps for Warm Curing Rosin 

Warm curing rosin requires: 

• An airtight glass jar 
• A metal dab tool 
• A heat mat 
• An oven (optional) 

1. Scrape a batch of freshly pressed rosin from its parchment paper, using your dab tool. 
2. Place the rosin inside a glass jar, filling it to no more than 80 percent of its capacity. Then immediately seal the jar. Make sure you’re using a heat-resistant jar. 

2. Apply the initial heat. You want to keep your sealed jar of rosin at a temperature between 90 °F–130 °F for at least 30 minutes, up to a few hours. You can achieve the necessary heat using an oven or a heat mat. Check the extract every 30 minutes and remove the jar from the oven (if applicable) after the rosin separates. 

3. Let the rosin mature. Use a heat mat to keep the rosin warm for several hours to several days while it matures. Consider the following guidelines. 

Note that while the quick-melt method will give you faster results, it also sacrifices more volatile terpenes. For best results, keep your temperature below 130 °F and use a low-and-slow approach. 

5. Remove the jar of rosin from the heat source. Always let the rosin cool to room temperature before opening the lid. 
6. Store the cured rosin in a refrigerator or freezer. Once the rosin is cured, maximize its longevity by keeping it in a refrigerator. You can even place it in the freezer to maintain its quality for 6 months to a year. For long-term cannabinoid preservation, one study found the ideal freezing temperature to be -4 °F (-20 °C). 

Commercial Rosin Curing Tips

1. Use a straight-sided jar for curing rosin. This will make the rosin much easier to remove with your dab tool. 
2. Wait at least 20 minutes before opening the container when removing cured rosin from a refrigerator. If you open it before it reaches room temperature, the condensation may ruin the quality of your extract. 
3. Don’t underfill the jar with rosin. Just as you don’t want to fill your jar all the way to the top, you also don’t want to under-fill it. A half-empty jar also accelerates oxidation due to the excess air. Strive for roughly 80 percent full. 

4. Keep your rosin in a dark place while it cures. It’s not enough to simply keep it at room temperature. Light rapidly degrades cannabinoids, so darkness is your friend when it comes to preserving quality. 
5. Avoid whipping the rosin if you’re looking to achieve a sauce or rosin jam. While whipping your rosin gives you a more uniform consistency and sometimes a more desirable texture, there are downsides. Agitating the extract can result in terpene loss. If this is a concern, skip the whipping step altogether, especially after a warm cure. 
6. Use a rosin press to provide the heat for warm-curing. If you don’t have a heat mat, rosin presses are also useful for a warm cure. Do not apply any pressure. Just make sure that the plates make contact with both the top and bottom of the jar. The jar must also be heat-resistant. 

For more tips on achieving excellent results, check out our fundamentals guide, What Is Rosin?

Rosin Curing Is an Art and a Science 

Once you know how to make rosin, curing is the critical final step to master. The above guidelines are simply meant to get you started. Your rosin curing results will vary depending on numerous factors, including the strain and age of your starting product, the quality of your rosin pressing equipment, your curing time and temperature, and the techniques you use. 

Experiment with both warm and cold methods, explore different cannabis varieties, and adjust your techniques with each cure until you find the optimal flavor and texture combinations for yourself and your customers. Curing rosin effectively doesn’t require a lot of labor, but it can make all the difference in the world.