This is considered to be a highly potent way of concentrating magical power. The time to do this is during an auspicious astrological period. The yantra should be drawn using the eight Kaula perfumes. Outside the yantra the root mantra should be written. The Devi should be invoked into the yantra in due form.
All good substances are to be used.
The yantra is then entwined with gold and silver thread, and placed into a metal holder and may be worn on the person. Yantras should always be used on the level. If drawn on paper the colours preferable are red, orange, yellow or a combination of these. A yantra without bija mantras is dead. They can be drawn to whatever size is required.