I was so intrigued. So I rushed to mu kitchen and find a little plastic bag with real poppy seads. I don't have any magnifying glass here unfortunately, but the seads look very much like those on the picture here, with net like relief on their surface. They are not all of the same colour, some are black, some are grey. Each of them have one little black dot.But you can only see it on those that are grey.
Well, I hope my message helped in anyhow in your investigation.
Remember "BOTI"! :-)) (One phrase has been repeated so often on this site, so I decided to make an abbreviation for that :-), so BOTI would be "Better out then in!")
Keep doing what you have started. Good health to all of you!