Fig. 4
From: Current progress on murals: distribution, conservation and utilization
Some strategies for restoration and protection of murals. The upper two photos were shot by the authors. The Egyptian mural is credited to “Ancient Egyptian Murals at the Metropolitan Museum of Art in New York (3)" by mharrsch, and the image is licensed under CC BY 2.0. The bottom picture is credited to “Mogao, by txikita69”, and this image is licensed under CC BY-NC-SA 2.0