DIY Kitty Crack: ultra-potent catnip extract

Step 12 Filter off the salt

The last step in getting a clear toluene solution is to filter off the salt and other insoluble material. Cut a coffee filter into a circular disc about 4" in diameter. Fold it in half, then in half again. Pull out one of the quarters to make a cone-shaped filter. Place this in the middle of your funnel, over a collection vessel. I would recommend something made of glass that can withstand the toluene. I'm using a glass vial.

Use the eye dropper to put the toluene/salt/junk solution on the filter and let it all pass through. What comes through the other side may be tinted a little yellow or green, but it should be clear and water-free.