Our final data concern the egg shells themselves. All eight eggs had good, normal-thickness shells. As the photo shows, the pigment that determines the colour of the shell is only laid down in the outer shell.
While we technically have two “colours” of egg (“white” and “brown”), in actual fact the colours range over a fairly broad palette. Colour perception is notoriously subjective, so we used colour swatches from Resene Paints’ Multi-finish range to establish a closest approximation. The results below are from lightest to darkest.
Swatches were held up against the eggs under natural light from a north-facing window, in moderate overcast weather conditions, around midday.
The following table expresses the weight of the shells wet, dry (dried in a 100˚C oven for 30 minutes), and expressed as a percentage of the total weight of the egg.
|Venus||9 g||6 g||12.5%|
|Lily||8 g||6 g||12.12%|
|Frida||9 g||6 g||15%|
|Poppy||8 g||6 g||12.9%|
|Neroli||8 g||6 g||13.8%|
|Claire||7 g||5 g||12%|
|Ella||8 g||6 g||10.8%|
|Bessie||7 g||7 g||12.1%|
†Wet weight of shell as a percentage of total egg weight, i.e. how much of the egg you can’t eat!