I know it’s nothing new but I’ve been wanting to try this for ages. Today I bought a fish tank (a cheap, plastic thing) and placed it on my lightbox with the flash at 90 degrees to my camera. I experimented a bit and found that the plastic seemed to hamper the sharpness of the image. Or else, I didn’t set the flash up properly – I’m undecided what the problem was. I ended up photographing the ink from above the fish tank. There has been no post processing on this image except for a tiny bit of clarity and contrast.