What is the current method[s] or forensics used by museums and other
institutions to date fabric, particularly historical to WWI?
     I've heard about a carbon method and a newer technology using laser
and now some persons are saying DNA. Others say that these methods are
not appropriate as they can only date in hundred-year or larger
increments; rather dyes are the most definitive method.
     Any light shed on this subject would be appreciated as well as
books or other printed matter to read.