Tinta y tinto (Spanish for black ink and red wine)
Through a process of oxidation, reduction, and light manipulation, Juniper stains and colors paper with red wine and a rich black pigment made of the wild harvested mushroom Coprinopsis atramentaria.
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The STEAM Journal:
2, Article 9.
Available at: http://scholarship.claremont.edu/steam/vol1/iss2/9