Abstract
Seasonal and spatial characteristics of salt efflorescence on brick walls of the Shimoren Kiln were investigated. The amounts of salts were larger; in winter than in summer, on a south-facing wall than on a north-facing wall, and on a 1st(ground) floor wall than on a 2nd floor wall. Gypsum and epsomite were occurred in summer, whereas thenardite and hexahydrite were dominant in winter. Many kinds of salts were detected in mid-winter: gypsum, syngenite, thenardite, hexahydrite and halite existed from lower to upper locations on the internal 1st floor wall, and nitratine and starkeite were observed on the external wall. The part where gypsum and syngenite occurred has water content of about 20%. The part where thenardite and hexahydrite existed has water content of less than 5% and 10-20%, respectively. Thus, salts prefer their own moisture condition when they appear from host rock to outside.
