Raisins Are Grapes

Raisins are grapes that are dried up, all the water is removed. If you drop a raisin in water and leave it there for a while, it will swell up and resemble a grape. In some cases it will almost look like a fresh grape depending on how the water was removed. 

Normally it won't quite resemble a fresh grape because the drying process changes the cell structure but when it is fully hydrated, it would still be a grape, just not fresh looking. It would look like a bruised grape with some wrinkles.