Romans in China?

I've seen programs about traces of European settlers along the silk road that date back to ancient times. There are actually remains of those settlers that reveal they had blonde and red hair with blues eyes. I've found the following information about possible Roman prisoners held in China:

The improbable quest for Romans in China begins with an American with an improbable name: Homer Hasenpflug Dubs. A noted China scholar at Oxford University, Dubs was the earliest academic to flesh out the possibility of "a Roman city in ancient China," as he put it in a lecture before the China Society in London in 1955.

Dubs was intrigued by the mention of a city and county called Liqian in a government land register of AD 5, compiled at the height of the Han Dynasty. At the time, Liqian (or Li-jien, in some transliterations) was also the ancient Chinese word for Rome or the Roman Empire-a name derived, perhaps, from Alexandria, then under Roman control and a place with which the Chinese had indirect contact.

Drawing on ancient texts, from Western classical poets to official Chinese court histories, Dubs proposed that the Romans of Liqian were legionnaires who had been swapped as prisoners of war or mercenaries from empire to empire until they finally wound up in China - more than 4,000 miles from home.

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Knowledge of our past help unlock the mystories that surround our future.

Have you ever heard of a light density sword made in China made of steel that is strong, durable, and light. Yet even today we don't know how to make that same kind of metal. The materials come from this earth, so how did they make those swords???