just testing some experimental coring photos
I remember your posting these back in September 2023. At the time, I worked on them a bit in Photoshop to enhance the detail.
As I suggested back then, there is too much light when photographing the coring, so the detail is blown out. If you have an iPhone 15, it takes very good low-light photos. Just turn off the flash.
If not, then you can try either (a) adding more light but further away (like a table lamp or floor lamp), or (b) stretch a bit of cloth over your camera's flash. The latter is difficult because the flash is so close to the lens in mobile phones. You'd probably have to secure it with a bit of tape. You don't want a tight weave fabric, as it will be too opaque to let some of the light from the flash through. Another alternative would be to tape a bit of semi-opaque plastic over the flash. That, or buy a inexpensive camera just for photographing your work.
At any rate, good luck. Below are the enhanced pictures I posted as an example back in September.