Woodcut blocks are printed with light pressure, and are capable of printing several thousand impressions, and even at this period some prints may well have been produced in that quantity. Many prints were hand-coloured, mostly in watercolour; in fact the hand-colouring of prints continued for many centuries, though dealers have removed it from many surviving examples. Italy, Germany, France and the Netherlands were the main areas of production; England does not seem to have produced any prints until about 1480. However prints are highly portable, and were transported across Europe. A Venetian document of 1441 already complains about cheap imports of playing cards damaging the local industry.