Why Lime Mortar is perfect for stained glass restoration #stainedglass In this video we learn about how to use traditional Lime Mortar to glaze stained glass into stonework. It is one of the oldest known types of mortar, used in ancient Rome and Greece, when it largely replaced the clay and gypsum mortars common to Egyptian construction. Modern cements are often harder than the surrounding stone or brick, so these types of cement can cause damage to the surrounding stone as moisture cannot easil