May I store canned pineapple in the open can for some days in the fridge? Or will the acid solve unhealthy substances out of the can?
Nowadays the cans for foods are sealed inside with a kind of lacquer to minimise the probably contamination with lead. The contamination depends additionally on the storage time and acidity of the content. But contamination is very reduced compared with old cans without inside coat. Do not buy cans that are damaged or disfigured in some way. Never use food from rusty cans
But when a can is opened and the inside of the can comes into contact with oxygen in the air, corrosion, which is minimal while a can is sealed, occurs more rapidly. And while opening a can, you might hurt the seal.The best is to put the leftovers pineapple in another container made for foods.