Rosin is one of the most fashionable extracts currently, since it is achieved by directly pressing the flowers or the “hash” by applying pressure and temperature. It is the cleanest and fastest method to obtain a high quality concentrate of cannabis oil. The result is the mixture of all the trichome heads in a very sticky texture mass with yellowish to amber tones, with a very high concentration of cannabinoids, terpenoids and flavonoids. It must be said that Rosin is an extract that does not deceive, it doesn’t improve the material, it just concentrates it. If the flowers you want to use are of poor quality and do not smell good, the result will be an extraction at the same level, more concentrated, but the same quality. If our base material is fresh the result will be light and if it is old it will be dark. Everything will depend on the material you are willing to process.
Processes and material
The process is the same as that of squeezing a fruit to extract the juice. In this case we extract the content of the trichomes, which at room temperature are solid; that is why we need sufficient temperature to melt the essential oils that they contain, which through pressure are forced out through the filter.
For this we are going to use the famous “tea-bags” or rosin bags to introduce the content and high-quality baking paper, where the rosin will be adhered and we will be able to collect it without losses.
We must cut enough oven paper so that the bag is enclosed in the middle of the papers, so that the extract does not come out through any of the 4 ends, that is, we will give a margin of at least 3 cm. for each side of the bag. Everything will depend on the material that we are going to press.
Rosin bags or tea bags
There are already several brands on the market that have specialized and customized bags / filters for use in rosin presses. There are different microns, and depending on the material that we are going to press, it is convenient to use one or the other so that the extraction is clean of vegetable mass or residues such as dust.
The temperature used is very important for the preservation of terpenes and flavonoids, causing aroma and flavor. We know that some of the terpenes volatilize at room temperature, so the higher the temperature or the longer the time they are exposed to, the more acute the loss of these valuable components of the trichome will be, and the quality of the rosin will be affected.
The texture of the rosin will also vary depending on the state of the trichome, humidity, oxidation …
A fresh plant with 10 days from its cut or less tends to give a more liquid and difficult to manipulate return, but with a high concentration of all terpenes, and as some of these more solvent terpenes evaporate over the days, the oil begins to have more consistency. The concentration of Canabinoids is also very important, since it has been proven that the high concentrations of CBD also provide this texture, which is always oily and difficult to handle.
If we start with a drier or cured trichome, the resulting rosin is usually a darker mass and can be manipulated with the hands at room temperature, and in some cases it can be hard until it can break like glass, also called a “shatter” texture. . This type of texture is not the most fragrant at room temperature, it needs to be heated to evaporate the terpenes. It is also possible to achieve it by pressing at high temperatures (+ (80 · C)
What bags do I use?
To make bubblehash Rosin (made with water and ice) or dry-sift (dry screening) it is most convenient to use the filters of the minimum possible micronity, in order to avoid any impurity that dirties our rosin. Currently 25 microns are used, since it is understood that no vegetable residue or dust will pass that filter, but there are also up to 15 microns.
What temperature is optimal?
The temperature to be used is also the lowest possible, being able to start extracting from 35 · C (the highest quality materials) up to a maximum of 75 · C if what you are looking for is quantity and not quality. The minimum temperature is used to preserve to the maximum all the terpenes and lighter color of our rosin, since some terpenes volatilize at those degrees, and at higher temperatures more loss of aroma. The texture will also vary at higher temperatures, probably due to this evaporation of the more solvent terpenes.
Steps to follow
By pressing hash, we want to keep the temperature as low as possible, but increase the pressing time. In this way, they will not degrade the terpenes at too high a temperature, even so obtaining good yields due to the longer pressing time.
The pressure that we must exert is also the minimum (the minimum pressure is very relative, because it does not even begin to mark the manometer, it is the right pressure so that the bag is fixed and does not move, without actually crushing it)
From our own experience, we would let the bag preheat with the minimum pressure for at least 20 seconds (if it is of the highest quality) up to 60 seconds (of less quality). This is done with the intention of melting the contents of the bag and making it possible for it to exit through the filter.
Once preheated, we apply pressure very slowly until we start to see how the bag starts to get wet, here we should stop giving pressure and wait a few seconds for the oil to start coming out. At this point, we recommend applying pressure as you “spit” the rosin, very slowly and progressively. A very rapid increase in pressure can cause the bag to burst (“Blow-out”) and cause some of the contents to come out under pressure, mixing with our rosin. That is why it is always advisable to press slowly, testing and adjusting with each material that is pressed. When most of the content has come out, you can now exert pressure until reaching 700 Psi to squeeze the bag to the maximum without breaking it.
The flower or bud Rosin is obtained with the same process as the Hash Rosin but using different parameters of temperature, pressure, times and humidity.
What bags do I use?
First, the micronation we use for bags is different. We could use bags of 160 or 120 microns without the problem of dirtying vegetable remains from our extraction, but if the material is quite dry or crumbled, it would be advisable to serve 70 or 90 micron bags.
For better performance it is better to introduce the grass in the bags as evenly as possible, that there are no gaps or empty spaces inside the bag.
We must remember that we will never completely fill the bag. We will always leave 1 or 2 centimeters of margin to be able to close it by folding it by the closure, so that when pressing, nothing of the material can come out and mix with our extraction.
It is also advisable to pre-press the material when it is in the bag to achieve that uniformity. In the market there are already for sale metal molds to measure the bags to speed up this process, but we could do it with any other tool that allows us to exert pressure. Another system would be to pre-press the prepared bags in the same rosin press without temperature.
What temperature is optimal?
The first pressing we recommend doing it between 65 · and 70 · C, reaching a pressure of 200 BAR or 3000 Psi for 1 minute or 1:30 minutes, and from the result adjust.
In the second we can raise the temperature between 75 · or 82 · C and press until it reaches 300 – 400 BAR / 4200 – 4800 Psi (depending on how resistant your oven paper and bag are, at more pressure we could tear them) with the intention of finish squeezing the bag to the maximum. We will have it between 1 and 5 minutes, all depending on each material and the desired result.
In this way we can separate the different qualities of the same material, and if not necessary, we can press the material directly to 80-82 · C and leave it until it stops “spitting”
The best moisture for pressing grass
Humidity also plays a bigger role than we think. After the quality of the material, temperature and pressure, the relative humidity is the other factor to take into account to have all the return.
Too dry material wants moisture, so it absorbs a large amount of rosin before it comes out. This results in much lower returns than you should be getting.
· The ideal relative humidity for the extraction of rosin from grass is 55% to 62%.
These parameters will be different for each type and variety of input material. You will have to adjust and adjust, until you find the optimal point.
Therefore, there cannot be an exact value for any of the factors. But we give you a good starting point to get closer to maximum performance / quality.
How to keep it?
-The best way to keep any extraction in its presence and initial texture, is to preserve it from light, oxygen and temperature. It is normally kept in an airtight bottle and in the fridge. This is the way in which the essential oils of the plant are least deteriorated (cannabinoids, terpenes and flavonoids for the most part)
The shelf life can be unlimited if the rosin does not contain any impurities and is kept under the indicated conditions. But you can probably change its state or color over the months, it all depends on all the differentiating factors of each crop and extraction. There is no rosin equal to another.
For its transport we recommend Ripper Cold Case that will keep our extractions in a perfect condition all day.
-Do not manipulate directly with the hands, even if possible due to its texture. The imperceptible fat of our skin contaminates the Rosin and adds substances that can vary its consistency and quality, until spoiling it.
-When we go to press grass that possibly contains seeds, it is very important that there are none left in the bag. We have to make sure that our grass is seed free. The oils that they contain such as omega3 will also be extracted, mixing with our rosin and making it infumable.
-It is convenient to use a high quality baking paper. Some of low quality can contaminate our Rosin with fiber residues that come off when handling it.
-We should change the oven paper for each bag, since by exerting so much pressure the paper loses consistency and could crack or break, which would make it difficult to collect it easily and cause considerable losses. It would also contaminate the rosin with fiber debris.
-The pressed bags or also called “chips” with the dry material inside, still contain a high concentration of cannabinoids. There are some remains of rosin that are impossible to extract with this method. That is why they are used to make cannabis cuisine or creams for use on the skin (topically).