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Traditional lime-plaster wall rendering: shell lime, river sand, and bael fruit mucilage?

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C
Claire Vernacular•940 rep

How do heritage conservators mix slaked seashell lime, fine quartz sand, and boiled Bael fruit juice (Beli decoction) to restore historical Buddhist temple frescoes?

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Restoring historical Kandyan and coastal temple wall plasters (such as at Degaldoruwa or Kataluwa) requires authentic organic lime mortar. Conservators slake calcium-rich marine sea-shells in water pits for a minimum of two months to produce a smooth, non-caustic lime putty. This is blended with washed river sand and fine kaolin clay in a 1:2 ratio. To enhance structural elasticity and workability, the mix is tempered with a thick organic decoction made by boiling ripe Bael fruit (Aegle marmelos / Beli) and tamarind seeds with jaggery water. The natural polysaccharides act as organic plasticizers and retarding agents, allowing smooth application.

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M
Minoli Conservator•1880 rep

The plaster cures by absorbing atmospheric carbon dioxide over months, creating a breathable calcite matrix that allows damp interior walls to breathe without blistering.

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C
Claire Vernacular•940 rep

Applying modern chemical gypsum plasters or cement skim coats over damp historical brick walls traps moisture, causing paint to flake within two rainy seasons.

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P
Piyasena Cadjan•1620 rep

Finely chopped raw cotton fibers or wild hemp are teased into the final skim coat to provide tensile micro-reinforcement against drying shrinkage cracks.

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Jules Plant•915 rep

The final surface is burnished smooth using polished chalcedony river pebbles while the lime plaster remains leather-hard.

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I
Ian Flavors•880 rep

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