Validation of a Traditional Mercurial Formulation: XRD Analysis of Cinnabar Prepared by Siddha Vaippu Murai

Abstract

In Siddha medicine, Cinnabar (Lingam), a mercury sulphide mineral, is widely employed after undergoing specific alchemical transformations. Classical Siddha pharmaceutics assert that such processing converts elemental mercury into a stable and therapeutically acceptable form. Scientific validation of these traditional processes is essential for standardization and safety assurance. Aim of the study: The present study aimed to prepare synthetic cinnabar using classical Siddha Vaippu Murai methods and to characterize the crystalline phases of the prepared products using X - Ray Diffraction (XRD). Materials and Methods: Three types of Vaippu (synthetic) Lingam – Bombay Lingam, Cheena (Naattu) Lingam and Rumi Lingam – were prepared using purified mercury, sulphur and arsenic disulphide following procedures described in Anuboga Vaidya Navaneetham. Natural cinnabar was used as a reference. All samples were subjected to XRD analysis, and diffraction patterns were compared with standard reference data for cinnabar (α – HgS), metacinnabar (β – HgS) and sulphur. Results: Natural cinnabar exhibited diffraction peaks corresponding exclusively to α – HgS. Bombay Lingam showed 100% conversion to cinnabar. Cheena Lingam exhibited a multiphase composition comprising cinnabar (16%), metacinnabar (20%), and residual sulphur (64%). Rumi Lingam contained cinnabar (30%) and metacinnabar (70%). No elemental mercury was detected in any prepared sample. Conclusion: Among the three methods studied, Bombay Vaippu Murai produced phase – pure cinnabar comparable to the natural mineral. The results demonstrate that traditional Siddha pharmaceutical processes can achieve controlled physicochemical transformation of mercury. XRD proves to be a valuable tool for the scientific validation and standardization of Siddha Mineral Drugs.