After WW2 the Russian government banned all western music and so a bootleg industry grew,some of the bootlegs was cut onto old X-rays and if you put your album up to the light bones could be seen through it

I’ve heard of these but never seen one in person as they’ve become collectors items to some people for their novelty value,they looked like Flexi discs that you got free with some magazines if you remember those from the 80’s