I believe it was black & white as a similar question was posed here & I add a great deal of fluff:

http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=147174#Post147174

Can you provide an image of any marks just ahead of flats? Is it a 12 bore or a 10 bore?

Kind Regards,

Raimey
rs