As a result, most higher-quality papers are made with relatively little recycled fiber.
They found bacteria in all of them, but the towels made from recycled fibers were the most heavily contaminated.
However, an increasing percentage of the world's newsprint is made with recycled fibers.
Less than 10 percent of that tonnage represented recycled fiber.
It is made in specialized paper machines out of virgin as well as recycled fibers.
The borders of these categories become a little blurred, however, when both virgin and recycled fibers are used in making one product.
It is now common for cardboard to be manufactured with a large percentage of recycled fibers.
According to the Society's website, this is because using more recycled fiber in their magazines "would do more harm to the environment than good."
She said 6.5 percent of the newsprint used by the company contained recycled fibers.
She said The Times uses 8 percent recycled fiber.