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These structures, called yakhchāls (Persian for 'ice pit'), used a brilliant combination of evaporative cooling, thick insulation, and subterranean storage. Ice was created in shallow winter ponds, often shaded by tall walls, then transferred deep inside the dome. The key was a special, water-resistant mortar called sarooj, made from sand, clay, lime, ash, and even egg whites or goat hair, which sealed the walls. While ancient Chinese also stored ice earlier, the Persian design was specifically
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