The original papyrus documents, discovered in an ancient rubbish dump in central Egypt, are often meaningless to the naked eye - decayed, worm-eaten and blackened by the passage of time. But scientists using the new photographic technique, developed from satellite imaging, are bringing the original writing back into view. Academics have hailed it as a development which could lead to a 20 per cent increase in the number of great Greek and Roman works in existence. Some are even predicting a "second Renaissance".