The message
from martin contains these words:

On Sun, 5 Oct 2003 00:56:11 +0100, Janet Baraclough
wrote:

It's the grass that imparts the deep colour to truly free-range
egg yolks.

and not the maize pellets that you feed them?

That's correct. Hens which eat only pellets (or pellets with food
colourant, or pellets and grain) produce the paler insipid yolks you
find in battery eggs.

Janet