Lime mortar to restore historic buildings
Scottish researchers have been taking lessons from the past to keep the country's historic buildings standing.
Historic Scotland has been collaborating with Heriot-Watt University to find 21st century ways of using lime mortar.
It holds together most of Scotland's historic buildings and 20% of its housing stock. It fell from general use in the 1920s, but now science is helping it make a comeback.
BBC Scotland's science correspondent Kenneth Macdonald reports from near Bonchester Bridge in the Borders.
30 Sep 2013
- From the section Scotland