They brought it as an offering for Guru Hargobind. The Guru, however, cast the ash into the pool, saying: “This is mere charlatanry for one who has reduced his ego to ashes. The ash of mercury might transform copper into gold, but the reduction of ego transforms man into God.” Bhai Singaru and his brother ranked among the prominent Sikhs of the time. They also took part in Guru Hargobind`s battles with the Mughal troops.
References :
1. Mani Singh, Bhai, Sikhan di Bhagat Mala. Amrilsar, 1955
2. Santokh Singh, Bhai, Sri Gur Pratap Suraj Gianth. Amritsar, 1927-35