PBK9, the pigment known as bone black,is a pigment made out of calcined (charred) bones. Though mostly sourced from animals, some human remains were used (Phosphate being a key ingredient in fertilizer and bone char being used for beet sugar processing at the start of the 19th century).Memento Mori

3:00 a.m. philosophy

What is the essence of life if death is necessary for renewal? Biologically, your gut lining replaces itself every few days, your skin in weeks, and a new batch of red blood cells every few months, your bones every other decade. The only thing that remains untouched is the lens in your eyes. Poetic