From: "Phil Payne" 

> They are special bio-degradable bags, I think.

Our local supermarket uses "bio-degradable" carrier bags.

On the side, it says: "Although this bag is bio-degradable, you may
re-use it for shopping.  Degradation will start at around 18 months."

Yup.

And the process is complete at 18 months, 0 weeks, 0 days, 0 hours and
around 20 minutes.

They show no signs of change until they turn literally to powder overnight.

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