By taking a paint brush to a war memorial in Hyde Park, the Duchess of Cornwall lent her support to a new campaign called 'In Memoriam 2014'.
It aims to protect the nation's war memorials by marking them with 'SmartWater' - a traceable liquid that should deter metal thieves.
Project Manager Jon Teare explains more in the clip below.
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The retrospective is so in-demand the museum will open its doors all through the night for the first time since it opened in 1857.