Paper is dyed by being soaked into ink.
This kind of dyed paper is used in Kohitsu such as “Sekito-Kokinshū” or “Manjuin-Kokinshū”. (old anthology of poetry)

For making dyed paper, brown color is often used so that new paper can bear antique look.
The process of making dyed paper is as follows.

First, barks of paper mulberry are stripped off.

Then they are boiled in an iron pot to bring out the color.

The extracted stock is repeatedly strained to remove rubbish or impurities.

Paper is dyed in a vat full of dyed stuff.

After dyeing, it is hung up on the rope to make it dry.