Bitumen of Judea
Bitumen of Judea is a natural asphalt. It was used for waterproofing and as a brown pigment. It hardens when exposed to light, and this made it important in the history of photography.
Bitumen of Judea is a natural asphalt. It was used for waterproofing and as a brown pigment. It hardens when exposed to light, and this made it important in the history of photography.