We found one dictionary that defines the word untinning:

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1. untinning: Wiktionary

Opposite: tinning, coating, plating, galvanizing ▸ Words similar to untinning ▸ Usage examples for untinning ▸ Idioms related to untinning ▸ Wikipedia articles (New!) ▸ Words that often appear near untinning ▸ Rhymes of untinning ▸ Invented words related to untinning