The Materia Medica of the Hindus, compiled from Sanskrit Medical Works c4.s6.15

c4.s6.15

3. अथ कर्पूर रसस्य विधिः। तत्र पारदस्य सञ्चिप्रशोधनं कर्त्तव्यम्। शुद्धसूतसमं कुर्यात् प्रत्येकं गैरिकं सुधोः। इष्टिकां खटिकां तद्वत् स्फटिकां सिन्धुजन्म च। बल्मीकं चारलवणं भाण्डरञ्जनमृत्तिकां। सर्वाण्येतानि संचूर्ण्य वाससा चापि शोधयेत्। एभिस्चूर्णैर्युतं सूतं यावद्यामं विमर्दयेत्। तच्चूर्णसहितं सूतं स्थालीमध्ये परिक्षिपेत्। तस्यां स्थाल्यां सुखे स्थालीमुपरां धारयेत् समाम्। mercury, *gairika* (red-ochre), brick dust, chalk, alum, rock salt, earth from ant-hill, *kshári lavana* (impure sulphate of soda) and *bhándaranjaka*, or red earth used in colouring pots, in equal parts, rub together and strain through cloth. Place the mixture in an earthen pot, cover it with another pot, face to face, and lute the two together with layers of clay and cloth. The pots so luted are then placed on fire, and heated for four days, after which they are opened, and the white camphor-like deposit in the upper pot is collected for use.