Alan

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First pic is fine. On the rest - the camera is searching for what you want it to focus upon. Touch the marble on the screen to manually lock the focus, making sure that it is in focus before taking the pic.

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You must be making that extremely early.

Pelt

Nice!

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You are forgetting mid-years. And really, early mid- and late mid-years.

Oh please......

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Are you collecting - or accumulating?

Looks like a swirl that corked on the rollers (that happens).

Not a Lawn Chair.

I am questioning the AI quotation that MK owns the BL brand as a sub-brand. The BL marbles pictured above are torch pieces, not tank marbles.

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Your camera keeps guessing at what you want in focus and exposed properly - so it is choosing the background. Note how it's details are in-focus. The flash is firing to expose the background properly, washing out the details in the marble. Try daylight, flash off, non-textured neutral gray(ish) background and (most importantly) manual select center focus. That will set focus & exposure. Look at the details of the marble on your camera screen before taking the photo.

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The particulate is oven brick from the pot dissolving.

Post Civil War, as noted. Pics are out of focus and too much flash, but appears to be a solid core.

Far more likely that some ended up randomly in the clear cullet pile.