Testing
Ghat Diya with Four Coloured Wicks to Find the Defective Direction
A ghee diya with white, red and yellow wicks pointing to the four directions is lit on a water-filled earthen ghat in the North-East, over a mantra written in kesar; a wick that goes out before the ghee ends points to the direction holding a defect.
Four wicks: two of natural white cotton, one red and one yellow (made from mauli thread)
Ishaan (North-East) corner of the house or flat