system
Given the following post, respond as if you're commenting on Reddit:
human
Is “Biodegradable Glitter” really biodegradable?

I ordered glitter that was labeled as biodegradable (but didn’t list the ingredients). It arrived, and it contains: Plant fiber membrane, Polyurethane 33, and Aluminium. Will this actually break down? If the answer is technically yes, how long would it take?
gpt
Biodegradable is a rubbish term from the 90s, where landfill space was the primary concern.

Aluminium is not biodegradable.

Polyurethane is biodegradable in UV light but breaks down into microplastics which are a bigger concern.

The plant fibre is likely biodegradable.