The scrolls have long been a source of intrigue for scholars, but now researchers have managed to make sense of the ancient documents, and have obtained fresh insight into a festival marking the changing of the seasons.
Discovered in a cave in Qumran, Israel, in 1947, it has taken until now for experts to decode two particularly tricky parts of the text.
The collection is considered the oldest cold of the Hebrew Bible ever found, saying to at least the 4th Century BC.
Researchers pieced together more than 60 fragments to unlock the name of a festival that marks the changes between seasons.
Although it is not known who wrote the scrolls, they have been credited to an ancient Jewish sect called the Essenes.
The sect, known for their celibacy and voluntary poverty, are thought to have created them as an ancient library.
Scholars discovered a list of special occasions celebrated by the sect, marked through their unique 364-day calendar.
These included festivals of New Wheat, New Wine and New Oil, which were related to the Jewish festival of Shavuot.
Another festival, called Tefukah was also discovered – it is celebrated four times a year to make the transition between seasons.
The word, in modern Hebrew, means “period”.
Researchers also found annotations in the margins of the scrolls, thought to be corrections made by a scribe – and said they helped them solve the puzzle.
Dr Eshbal Ratson, told Haaretz newspaper: “What’s nice is that these comments were hints that helped me figure out the puzzle.”
Adding that the scribe’s added notes “showed me how to assemble the scroll”.
Dr Ratson worked with Professor Jonathan Ben-Dov at Haifa University to decode the two scrolls.
Haifa University has issued a statement saying the two professors are now working on translating the final scroll.
The other scrolls contained biblical texts, documents about sectarian regulations and religious writings that do not appear in the Old Testament.
And the Copper Scroll identified more than 60 places around Israel that were used to stash treasure.
The biblical texts found have been identified as 19 copies of the Book of Isaiah, 25 copies of Deuteronomy and 30 copies of the Psalms.