Why are lemons yellow and limes green? - BBC Science Focus Magazine

The Science Behind Lemons

Supporting Material Vol 1 - Colourful Language

Is there any scientific reason why lemons and limes are different colors? - Quora

New issue: Why it's time we changed our relationship with fat - BBC Science Focus Magazine

Lemons Not Turning Yellow: Why Do My Lemons Stay Green

27 Juicy Facts About Lemons - The Fact Site

Why are my Lemons Staying Green not Yellow? - The Micro Gardener

Is there any scientific reason why lemons and limes are different colors? - Quora

The Science Behind Lemons