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You're a bit heavy on the red. It's visible here when comparing the image background to the white page background. This won't affect the dark color of the coin. Try reducing the Red channel (maybe Magenta) saturation in post.
Danke viel mal: that steered me in the right direction. The lighting I used was "fluorescing" ( cant think of a more correct term) in the hologram..I would never have picked the magenta saturation as the key Thanks!