Justinian Follis - XIII Nicomedia

[Pierre M]

I saw the first one being sold for ~500€ (premium included) earlier in May.
Now I'm seeing the second one scheduled for an auction in early June.

The pictures are taken from different angles and with different color settings, so it's a little bit confusing.

Do you think it's just the same coin being resold or copies?
Everything seems to be identical except around the borders.

[Merinda]

I would say same coin but cleaned, I think the green in the first photo is patina, not lighting

[Joe Sermarini]

I don't think that original patina looks natural. It may have been removed because it was unnatural and looked strange.

[Callimachus]

Another possibility is that it may be in the photography and the processing of the picture once it has been removed from the camera.

When I have take photos of some of my coins that have a slight greenish patina to them, the photo comes out showing the coin a much brighter green than it looks in-hand. I then open the photo with my stand-alone version of Photo Shop Elements and remove much of the green color.  (If I wish, I could increase the amount of green too.)  The photo below of a Severus II follis from London is an example of this. According to the color controls in Photo Shop Elements, there is little of no green left in this photo. The greenish tinge on this photo is due to the yellow that hasn't been messed with. And this is how the coin looks in-hand by a window on a sunny day.

I haven't figured out what causes this, but it is likely some combination of background color, white balance, lighting, time of day if using natural light, and even the proprietary software on the camera. I mention the software on the camera here because my current camera seems to do this a lot more than a camera I had years ago.