The Positive Sciences of the Ancient Hindus c4.s2.25

c4.s2.25

The *Rasárnava* (*circa* 1200 A.D.) notices the colours of metallic flames, probably after Patañjali—*e.g.* copper gives blue flame; tin, pigeon-coloured; lead, pale; iron, tawny; blue vitriol, red. It may be noted that the *Rasárnava* regards mercury as a penta-Bhautic substance.