Baseball cards can become stuck together over time from moisture, heat, dust or pressure. When cards are stuck, it’s important to carefully separate them to avoid tearing or damaging the images and surfaces of the cards. Here are the recommended methods and materials to safely get baseball cards unstuck:

Start by examining the stuck cards closely without trying to separate them yet. Carefully inspect where exactly they are stuck – is it just a small corner or edge or are they fused together over a larger surface area? Identifying the problem area will help determine the best separation approach. You’ll also want to check for any ink, image or surface damage already present before attempting to pry the cards apart.

Gather your separation tools which should include a small blunt object like a playing card, reference card or coin to gently work between the stuck layers. You’ll also need some distilled water and cotton balls or q-tips. Distilled water is best as it is purer than tap or bottled water and won’t leave any mineral residue behind.

Place the stuck cards on a flat, sturdy surface covered with a thick towel or paper towels. This provides padding and absorbency under the cards in case any moisture is transferred between the layers during separation. It’s also a clean, controlled work area.

Check for the moisture content of the stuck area by carefully inserting the thin edge of a cotton ball or q-tip between the cards. Gently work it back and forth without applying pressure. If the cotton pulls away cleanly with no residue, the cards likely just need physical separation which can be tried next.

If moisture is detected on the cotton swab, a few drops of distilled water may be needed to help dissolve the “glue” holding the cards together. Carefully place a small amount of water directly onto the stuck area using a cotton swab or ball. Don’t saturate the cards – just a few moisture droplets is sufficient.

Let the applied water sit undisturbed for 5-10 minutes to allow it time to work between the card layers. During this time, avoid handling the cards to prevent shifting before they’re fully separated.

After waiting, take the flat side of a playing card, coin or reference card and gently try sliding it between the two layers where they are fused. Ease it back and forth in a sawing motion without using force. The idea is to break the moisture bond rather than rip the cards apart. Go slowly.

As gaps appear, use the thin card to carefully tease the layers further apart, working your way out from the center of the stuck region toward the edges in all directions. Don’t try to fully separate them in one quick move which risks tearing.

Once fully detached, lay the cards flat again and use dry cotton swabs or tissues to gently wick away any remaining moisture from the surfaces. Avoid rubbing which could damage inks or coating. Allow to air dry fully before handling or storing.

With patience and care, these techniques allow baseball cards to be gently unstuck and separated without harming game-used content, autographs, or statistically relevant information on the back. Proper materials and going slow are key to a successful repair when cards become fused over time. Following best practices preserves the historical record and enjoyment for collectors. With the right approach, sentimental or monetarily valuable cards can be restored to like-new condition. Let me know if you have any other questions!