Panchaloha five-metal alloy ratios: ritual temple bell casting in Pilimathalawa?

Casting sacred Buddhist temple bells and images in Pilimathalawa demands the traditional Panchaloha (five-metal) formulation: 78% pure copper and 20% refined tin to establish high acoustic resonance (bell-metal bronze), combined with 1% zinc (brass) for fluid casting flow, and ritual additions of 0.5% pure silver and 0.5% gold. Metals are melted in refractory graphite-clay crucibles over forced-draft charcoal fires at 1080°C. Deoxidizing the molten pool using dried coconut-shell charcoal covers prevents copper oxide gas entrapment, avoiding micro-porosity cracks across the flared bell sound ring.