All the books from Bait al-Hikma library, the most famous library in its day, were thrown in the Tigris River, and the Tigris changes color with ink.
Semua buku dari perpustakaan Baitul Hikma, perpustakaan paling terkenal di zamannya, dibuang ke Sungai Tigris, dan Tigris berubah warnanya karena tinta.