Medium weathered sandstone belongs to several kinds of soil
Three protection methods of stone cultural relicsThe protection of stone relics mainly includes three steps: cleaning, reinforcement and protection.1 cleaningThe objects of stone cultural relics are all harmful substances on the surface of the stone, including microorganisms, weeds, soluble salts, insoluble hard shells, dust, smoke, etc..According to the characteristics of cleaning method of cleaning agent and processing technology can be divided into two categories: water flushing; chemical cleaning method;
