Fruits with a red hue, such as tomatoes, guava, and papaya, contain lycopene, a reddish pigment and nutrients.

像西红柿、番石榴、木瓜等红色的水果，含有番茄红素，一种红色的色素及营养素。

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It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light.

这听起来很矛盾，因为这一假设背后的理念是，树叶在秋天产生的红色素是用于保护叶绿素这种吸收光的化学物质，以免它吸收过多的光。

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Prodigiosin is an intensely red pyrrole pigment produced by several bacteria, most notably, Serratia marcescens.

灵菌红素是由若干种细菌特别是粘质沙雷菌产生的一种红色吡咯色素。

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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