How old is the earliest surviving examples of Chinese printing?

Printing is an old technique, by the 2nd century AD the Chinese had developed and put into fairly widespread use the art of printing texts. Like most inventions, it was not entirely new, because the printing of designs and pictures on textiles had preceded the printing of words in China by at least a century. The earliest surviving examples of Chinese printing, produced before 200 AD, were printed from letters and pictures cut in relief on wood blocks.
    It’s always a pleasure to visit the different parts of newspaper operations. Printing is a really messy process because of the black, oil-based ink we use. If you hold the newly printed newspapers, you will come away with the black ink all over your hands and then probably get it on your clothes.
    That may change soon, with the use of a different type of ink. Several major daily newspapers are now trying out a new printing process called flexography. This process produces smear-free pages that are remarkably clean. Flexography is often referred to as "flexo". "Flexo presses use water-based inks that dry quickly, not like the standard oil-based inks that take much longer to dry. The new flexography inking process is also simpler and faster than the standard method. There’s one major problem, though. The ink may dry too quickly, and thereby gum up the machines. It could obstruct the presses, so that they won’t work right, or it might cause them to break down altogether. If the machines clog too easily, the process will have to be changed and retested. There’s a possibility that our newspaper will convert to the flexography process sometime soon. In any case, our readers have already expressed a definite preference for the new papers and clean hands.