Color inside front bonnet opening

I’ve noticed that the inside of the front of most E-type bonnets is dark. This contrasts with the body color and enhances the “cavern” effect of the scoop. What is the official position re colors seen through the front opening?

Body colour

They are all dark because light does not enter, not because of their color.

+1 on body color. If you check any of the Porter/haddock, etc book/guides to authenticity, you can see them there. Also check sales on Bring A Trailer for your year/series car. The photos of most are very comprehensive.