Pick apart the pine cones until you have about a cup’s worth.
Place in a pan with the water and the soda, and bring to a boil.
Then reduce the heat to the barest simmer and cook for about an hour or two—until the liquid is a rich, dark, red-brown, and amounts to about ¼ cup.
Strain, bottle, and use with calligraphy nibs or brushes. Fingers work, too!