Verdigriss

A green or bluish patina formed on copper, brass, or bronzed surfaces exposed to the atmosphere for long periods of time. Talking of bronzed surfaces that have been exposed to the atmosphere for long periods of time, Mr Philip Dyer uses this word as an explicit phonetic enunciation deployed as an aid to crossword spelling.

Somehow verdigriss has appeared on the mogany of my umberjig, must be the mizzle