Among other things, the Tarantinos stripped paint from faded black concrete floors and tracked down their original red pigment.

WSJ: The Pleasures and Pitfalls of Frank Lloyd Wright Homes

Among other things, the Tarantinos stripped paint from faded black concrete floors and tracked down their original red pigment also the shade of the terrace floor.

WSJ: The Pleasures and Pitfalls of Frank Lloyd Wright Homes

This works because the red pigment is physiologically costly to produce.

ECONOMIST: Birds do it, bees do it | The

He said that not only did people with red hair have less protective pigment than people with darker hair, but the pigment they did have appeared to be more likely to react to produce harmful agents associated with cancer.

BBC: Image of redhead celebrity Anne Robinson

These beads even bore traces of red ochre, used as a pigment.

BBC: NEWS | Science/Nature | Study reveals 'oldest jewellery'

To prove it worked, he started with a strain of the E. coli bacterium that produced small quantities of lycopene, the pigment that makes tomatoes red.

FORBES: Putting Evolution to Work