Why did my foil disintegrate when touching my spiral ham?

Your foil may have disintegrated when touching the spiral ham due to a chemical reaction between the aluminum foil and the acidic components of the ham, such as its glaze or marinade. If the ham was overly moist or contained ingredients like citrus or vinegar, it could accelerate this reaction, causing the foil to break down. Additionally, high temperatures during cooking can exacerbate this issue. It's best to use parchment paper or a roasting pan cover to avoid this problem in the future.