West Kennet Long Barrow 14
Image by treaclechops
West Kennet Long Barrow

Graffiti at WKLB.

I think razor wire and baton weilding cops could be the answer ....

scene: 30,000BC - Lascaux, France.

"If I've told you once ...... stop drawing on those bloody walls!", says Daddy Meso.

"I told you not give him that charcoal for Beltane", interrupts Mummy Meso.

Just goes to show though, some natural writing products, in the right enviroment, will last a very long time.