There is a posture for this process, too. We start by making a “vajra fist” with our left hand, which is done by pressing the thumb into the base of the fourth finger, our “ignorance finger”. We then wrap our other fingers around the thumb to make a fist and then we press this fist into the channel of our inner thigh on our left leg where it meets our torso. With our right hand, we also make a vajra fist, but extend our index finger and rest that hand on our right knee. Then we inhale once and bring the index finger of our right hand to our right nostril and press it closed. We then expel the breath through our left nostril. While we are doing this, we hold the following visualization: We visualize that all of the negative emotional states mentioned before take the form of a filthy, putrid black vapour, and that we are expelling these negative emotional states on the form of this vapour through our left nostril when we breathe out.
[Depicted from "Life as Practical – Practical Instruction to the Lay Practitioner - Part 18" May 2015, Canada.]