Cold Water Extraction to Make Hashish.


The cold water extraction method of making hashish causes THC laden trichomes to sink while the vegetable matter floats. After being separated, the vegetable matter is removed and the trichomes are collected, dried, and pressed into hashish.

The amount of marijuana you should convert to hashish on your first attempt should be less than an ounce. That way you can see if the cold water extraction method works for you, without using much weed. If you like the method, use larger amounts for a larger yield.

If you use good marijuana you should get a 20%-25% return when using the cold water extraction method. Starting with 28 grams (1 ounce) of marijuana buds should yield about 5-7 grams of hashish powder. If you start with leaves or low quality marijuana you will get less.

You will need:

  • 7 to 28 grams of good marijuana buds

  • 2 containers (18-24 oz capacity)

  • very cold water and ice

  • high speed blender

  • coffee filters

  • hose

Prior to extraction it is very important to make sure the marijuana is as dry (keep the temp below 90 degrees F when drying it). When the buds are as dry as possible, crush them up with an herb grinder, a pair of scissors, a coffee grinder, or something similar.

Crushing the marijuana directly over the blender is a good idea if possible. When ready, add water and ice to the blender (with the marijuana). A 50-50 water-ice mix works well. If you are using under an ounce of marijuana, try 6 ounces of cold water mixed with approximately the same amount of ice.

Set the blender to medium-high and blend for 1-4 minutes. Pour the blended mixture into container 1 as soon as you finish, then place the container in a fridge.

See-through containers allow you to see when the plant matter has floated to the top and the water is clear and a wide mouth container (about 6 inches wide) makes it easier to remove plant material.

After about 30 minutes in the fridge, a lot of the plant material will have floated to the top of the container, while the heavier trichomes will have sunk to the bottom.

When the water between the trichomes and plant material is very clear, keeping the container as still as possible, remove the plant matter floating on the top (with a slotted spoon, if available). Put the material you remove in container 2.

Now take container 1 (with the trichomes on the bottom) and syphon off the water into the same container that holds the plant material (container 2). Stop siphoning when the water is within 1 inch of the trichomes. The material at the bottom of container 1 is the hash powder.

Fill the container that contains the hash powder with some very cold water one more time. Add enough water to cover the hash powder less than 6 inches of water. Shake or stir the container for a minute or two.

Then put the container back in the fridge and let the mixture settle for a minimum of 15 minutes. When all the hash has settled back to the bottom and the water towards the top of the jar is clear, remove any plant material and then carefully siphon off the water to within 1 inch of the material at the bottom of the container. Later, repeat this process with the contents of container 2.

To separate the water from the hash powder, strain it through a coffee filter. Make sure you get it all, it is potent. After the water has drained through the coffee filter, use a spoon to push the hash powder to an edge of the coffee filter.

Then roll the hash up in the filter, and gently squeeze out more water. After that wrap a towel (or something like paper towels or toilet paper) around the filter to absorb more moisture. Then scrape all the hash powder out of the filter.

Until the hash powder is pressed, you don't have hash, you have hash powder. Pressing means using some form of pressure to force the powder into a cohesive mass. The easiest way to do this with a small amount of hash powder is to use a pollen press.

Prior to pressing, hash powder that has been collected using the cold water extraction must be dried. Wet powder won't press properly and is prone to mold. After collecting it, store in a dark dry area where there will be no strong breezes (or it will blow away).

A cup or some other container will do. Stir the powder occasionally so it dries faster. Keep the temperature between 65-80F and the humidity low. It will usually take a week or more in an environment like this to dry the powder for pressing.