Background:Rasashastra is a branch which deals with the pharmaceutics of Rasaoushadhis. Bhasmas are one among such Rasaoushadhis which are known for their low doses and fast action. A verse from Rasaratnasamuchchaya says that the bhasma prepared by using Mercury as media is of best quality.Materials and Methods:Following this principle, Yashadabhasma (Zinc calx) was prepared by subjecting it to Samanya shodhana (general purification method for all metals), Vishesha shodhana (specific putification method for Zinc), Jarana (roasting) and Marana (incineration) with Parada(Mercury) as a media under Gajaputa (classical heating system with 1000 cowdung cakes).Results and Conclusion:Yellow colored Yashadabhasma which passed all the classical bhasmaparikshas (tests for properly prepared calx) was obtained after two putas. The bhasma did not pass Nishchandratva(free from shining particles) test after 1stputa but was passed after giving it 2ndputa.
Yashada bhasma (Calx of Yashada i.e. Zinc) which has its main indication in Prameha (Diabetes) and Netra vikaras (Eye disorders) was prepared according to the prescription in the Ayurvedic classics and subjected to various bhasma parikshas, including the Namburi Phased Spot Test (NPST), one of the qualitative tests described for various Ayurvedic preparations. NPST helps differentiate between, and thus identify, various bhasmas. It depends upon the pattern of the spot, which develops after a specific chemical reaction. Three market samples of Yashada bhasma, which were said to be Parada marita (incinerated using Mercury), were also subjected to the above tests and results compared. The various bhasmas exhibited marked differences in colour, and though NPST yielded desired results for all the samples, there were differences in their spot patterns and colour. The bhasma prepared in our department produced the most accurate results.
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