[GrzeM]

I understand now, that the attack bombs were rather 12,5 kg, and that data about colours applies to the 12,5 kg bombs in particular.
I checked again, and my Polish book states "light grey" for the 100kg bombs.

However, the black and white photo I posted in my first post clearly shows bombs bigger than 12,5 (50 or 100kg I suppose) in two shades of grey.

Don't know about that bomb from Duxford.

Of course I don't state that I KNOW what the colours of the bombs were, I was only intrigued with that original b&w photo showing two shades of bombs, and connected it with the data from the Polish book.

I'd never dare to determine the exact colour from the b&w photo, but in my opinion it is possible to determine from the b&w photos that the two bombs had different colours - if they have on the photo visibly different shade of grey. And this can be clearly seen in that photo on the top.

I'm posting the drawings of the 12,5 kg bombs, lef is the normal bomb, and on the right the attack one. It has visibly different fin.

Thanks for all the informations, and please for opinions about the b&w photo in my first post.
G.