23-04-2026, 07:33 PM
From a process engineering perspective, it matters whether something is dissolved or not.
Sugar and salt dissolve in water. I can’t filter them out anymore.
Ground activated carbon mixed with water—in that case, the particles can be filtered out again.
Turkish coffee. You have to wait until the particles have settled before drinking it. It contains both the dissolved portion and the particles.
The dissolved coffee is absorbed into the parchment, but the particles just sit on top.
One is subject to abrasion, but the other is not.
I also rule out bleaching by sunlight, since only two pages of a book are exposed to the sun when it’s open.
Iron or not is irrelevant.
Translated with DeepL.com (free version)
Sugar and salt dissolve in water. I can’t filter them out anymore.
Ground activated carbon mixed with water—in that case, the particles can be filtered out again.
Turkish coffee. You have to wait until the particles have settled before drinking it. It contains both the dissolved portion and the particles.
The dissolved coffee is absorbed into the parchment, but the particles just sit on top.
One is subject to abrasion, but the other is not.
I also rule out bleaching by sunlight, since only two pages of a book are exposed to the sun when it’s open.
Iron or not is irrelevant.
Translated with DeepL.com (free version)