Roof tiles in Kyongju were made with heavy cream-coloured clay.

Evidence

The tile is about the size of a large old-fashioned roof slate – just under 30 centimetres by 30 (12 inches by 12) – and it’s made of heavy cream-coloured clay. — Neil MacGregor, A History of the World in 100 Objects, 773

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 773