Fig. 4From: The method to soften the concretions of ceramics in the “Nanhai I” Shipwreck of China Southern Song Dynasty (1127–1279AD)Micrograph on typical samples: a The interface of sample N20; b the interface of sample N22; c the interface of sample N3; d the interface of sample N23; e the interface of sample N7; f the surface of N21Back to article page