Mons Meg canon (now re-installed at Edinburgh Castle) is the largest and most important Medieval canon in the world. 

Halcyon Conservation were sub-contracted through AOC Archaeology and Historic Scotland to Sympathetically strip the old paint system from the canon, and ensure no damage was caused to the substrate metal. 

The canon was stripped with a powdered plastic medium, using the Hodge Clemco 'Softclean System'.