7. Heat and Dry: The fiber mixture comes out of the head box formed into a sheet, but it’s still more than 99 percent water. To reduce water content to the final 4 percent, the sheet goes through several sets of large rollers, each one hotter than the last.  Photo 16 of 19 in Process: Watch a 147-Year-Old Paper Mill Produce a “Black Licorice” Roll

Process: Watch a 147-Year-Old Paper Mill Produce a “Black Licorice” Roll

16 of 19

7. Heat and Dry: The fiber mixture comes out of the head box formed into a sheet, but it’s still more than 99 percent water. To reduce water content to the final 4 percent, the sheet goes through several sets of large rollers, each one hotter than the last.