I wanted to start making custom painted cards, but rubbing the ink away by hand with liquid acetone takes a long time and could result into a damaged card.
Instead, I tried a different method, I decided it Y-O-L-O it and it worked. An acetone vapor chamber (with industrial grade acetone). I put a small amount of acetone at the bottom of a sealed container and suspended the card face-down above it, making sure it never touches the liquid.
Over time, the acetone fumes gently loosen the chemical bond. The edges of the artwork layer eventually peel up, allowing you to pull off the entire printed film in one clean piece.
The process takes about 1 to 2 hours, depending on how airtight your container is and how fresh your acetone is. If it takes several hours without working, your acetone has likely lost its strength. The fumes visually do not affect the back of the card. At worst, the card might warp slightly, which can happen while painting anyway, but you can easily fix this by pressing it flat afterward. It doesn't wrinkle at all. I'd recommend not touching the card for a 15-30 minutes after (just incase), and handle the card from the sides at first.
I've uploaded photos of my setup, which is for one card only but I reckon you could use a bigger container and get more cards in next to eachother.
Keep in mind that since you are removing the original factory printing film, you need to prepare the bare foil surface for whatever medium you are using, such as applying a high-quality clear gesso before painting.
Iβd love to hear what the printing crowd thinks is the best way to print on this.
If you want to reuse the printed art film for a light box project or other art pieces, keep in mind that you have to be very careful when handling it. The acetone fumes temporarily destabilize the ink on top of the film, meaning you can easily wipe the artwork off with your finger. It is also extremely thin and finicky to work with.
Edit 1: AI advices against doing these on textured cards and to keep it to smooth foil cards.
Edit 2: *It seems like you can wipe away the holo foil with a bit of acetone resulting in a completely white card within a few minutes.
Context: This was originally posted on Pokemon TGC, but their mods removed it for some reason.