Why Are The Inside Of Chips Bags Shiny Why Are The Insides Of Chip Bags Shiny?

Why are the insides of chip bags shiny? - why are the inside of chips bags shiny

Foil pouch keeps out the light and more chips.

Light to the oil) from oxidation (rancidity, especially speeding on the chips because they are an oily product.

Confirmed by the following link:
Why spend money (actually used) in sacks? She says she stays out of the UV-chip, making it last longer.