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Traditional spouted water vessel (Kothalaya) ceramic engineering: unglazed evaporative cooling?

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A
Arjun Ceramic•905 rep

How do artisanal potters in Kelaniya throw narrow-necked spouted Kothalaya flagons on manual potters wheels to maintain clean drinking water hygiene?

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✓Accepted Answer

The Kothalaya is a traditional Sri Lankan spouted earthenware water vessel designed for hygienic community drinking in temple alms halls and rural homes. Thrown from alluvial river clay tempered with fine quartz sand on a manual flywheel (Sakaporuwa), it features an elegant spherical body, a narrow flared neck, and an elongated curved drinking spout. Because drinkers pour water directly into the mouth without touching lips to the vessel, communal contamination is prevented. Fired at low temperatures (under 800°C) without surface glazes, the porous earthenware wall allows micro-transpiration that cools stored water 3°C to 5°C below ambient room temperature.

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Piyasena Kilns•1640 rep

The spout is hand-formed as a hollow clay cylinder and luted onto the vessel shoulder using wet clay slip while both parts are leather-hard.

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A
Arjun Ceramic•905 rep

Before firing, potters burnish the exterior leather-hard clay with smooth river agates to compress outer pore platelets, creating a soft natural shine without glazes.

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Guru Dharmasena Wood•1830 rep

Water stored in unglazed terracotta flagons leaches trace silica and natural earth minerals, balancing water alkalinity naturally.

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Vaidya Harsha Arishta•1770 rep

Vessels are boiled with coarse sea salt and fresh betel leaves every few months to sterilize open interior micro-pores against bacterial biofilms.

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C
Chloe Vernacular•930 rep

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