What is the green coating on the 16 penny nail for?

thier are ardox nails, ring shank, brite and coated sinkers. what is the coating for on the nail?What is the green coating on the 16 penny nail for?
coated sinkers heat up with the friction and the green is a glue sooo it bonds betterWhat is the green coating on the 16 penny nail for?
It's oxidization...which means that it has rusted...
tis glue.......friction activates it when you pound the nail into your project.

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