Answer: Milk!
To the best of our knowledge, milk has never been used to make paper.
But so many other materials have, from potatoes (e.g., Arjowiggins Curious Matter, which was used to make the Blue book slipcase above) and recycled T-shirt cotton (e.g., Mohawk Renewal), and even Limestone dust (most papers that bill themselves as “stone paper”).
Other materials include bamboo, sugar cane, and of course there are a variety of hemp-based sheets, as well.
Oh, and if you do come across paper made from milk, please leave a comment below.
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