Linen is made from the flax plant which produces cells 1 to 7 centimeters long and 0.010 to 0.015 millimeters in diameter (like very thin human hair). This is a photograph of one of the cells. It consists mostly of cellulose, the nucleus of the cell having disappeared after doing its job. The fiber-cell is white but is discolored to yellow at certain points. The body image is the result of different shades of yellow. In a black and white photograph, the silver particles in high concentration appear black. In different concentrations, the silver particles appear as shades of gray.