Not so long ago, there was a lot of chatter that a certain posh egg brand was implementing paprika and marigold into its chickens' diets to create that gorgeous, deep orange colour in the yolks of their eggs.The brand was Clarence Court's Burford Browns, of course, with the instantly recognisable middle-class favourite so desirable that they even made their way to the King and Queen's breakfast table.Following the discovery, some shoppers felt conflicted: they thought their Burford Browns were richer in colour because a. they were paying a premium price and so b. the chickens must be happier and healthier.And while the above may still ring true, some complained that adding paprika to increase pigment is bordering on deceptive.But though it's a no-brainer that a richer yolk looks better, what does it actually indicate? And does this mean paler, more yellow varieties are a no-no?Speaking to the Daily Mail, Henry O'Connor, founder of Better Eggs, revealed that the yolk colour can offer clues about the hen's nutrition and welfare.And it's bad news if you crack an egg to find a pale yellow yolk because, according to the expert, it points to a grain-heavy diet, which is typically seen in lower-welfare or more confined systems where hens have less access to varied outdoor feed sources.A more classic yellow yolk, however, is usually the middle ground and often reflects a balanced diet.