Individuals and organisations which look after war memorials are being encouraged to apply for free "SmartWater" kits.
A unique traceable liquid, which is painted onto the memorials, "SmartWater" is virtually impossible to remove - and can even withstand burning and sand blasting.
Today, the Duchess of Cornwall helped to protect the Royal Artillery Memorial on Hyde Park Corner, by applying the fluid with a paint brush.
The Duchess of Cornwall visited Spitalfields City Farm this morning, in the first stop on her tour of the Chelsea Fringe Festival.
The three week festival is independent of the official Chelsea Flower Show and aims to celebrate everything about gardening - from grassroots community projects to avant-garde installations.