| Elemental Zinc is a reducing agent, I assume it's forming zinc oxide. It's a common technique for reducing amine oxides.
The first reference I've seen with respect to using it on DMT is from a Fish & Horning (1955) analysis of some Anadenathera snuffs. K Trout also commented on the method in his Notes on the Genus Desmanthus. Searching either here or the Nexus, I'm sure you can find the exact quotes.
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