Shine ultraviolet light at it and it will shine back green or orange.

ECONOMIST: Finding fault with genes

Here the mood seems as bright as the shine on a new green-and-yellow Deere combine.

FORBES: Bucking the downtrend

To that end, green fuels require back-up generation that kicks in when the wind dies down or the sun ceases to shine.

FORBES: Shale Gas Crowned: So Why Do They Shun Obama?