Is tin foil biodegradable

Answer 1

Tin foil, so called, is these days more likely to be aluminum foil.

This is because aluminum is much cheaper, and is adequate for the purpose.

Both metals will degrade in the long time, but whether by biota (biodegradable) or by chemical means (corrosion) is probably immaterial.

Tin tends to be toxic to many biota, hence the use of tributyl tin in anti-fouling paints on boat hulls. These have a widespread destructive effect on their local environment. Which is now considered undesirable.