The article mentions some of them, but obviously this is an article for popular consumption and doesn't convey many details. One mentioned was that the way scri

The article mentions some of them, but obviously this is an article for popular consumption and doesn't convey many details. One mentioned was that the way script was written has changed over the centuries, and some documents contained some letters that are of an epoch different than the rest of them, or letters have been modified or new letters squeezed into gaps. Other techniques might include being able to use spectography to identify that the suspect letters were written using ink of a different composition. If you need more context, this one article that is mostly a personality profile won't contain it. But there are hundreds of books and thousands of research papers written about the dead sea scrolls.