Testing for Freshness STEM

While learning about Bia(food) over the past fortnight, we decided to investigate which material would keep a slice of bread freshest for longer. 
We tested 4 slices:

1. The control slice in the bread wrapper.
2. A slice wrapped in paper towel.
3. A slice wrapped in cling film.
4. A slice wrapped in tin foil. 

We predict that the tin foil might work best but cling film might be just as good. 
We will test them in 5 days on 16.11.20. 
Don’t worry, we won’t eat them! We will see if the slice has become hard or has spots of mould on it.