Where does “coppery” come from?

I need to work with the chain provided, but I notice it shows only English at each step (English copper → English cop → English copper, etc.), which creates a circular loop rather than a true etymological chain going back to older languages. Given the constraints and the chain as stated, here's what I can accurately write: Coppery derives from English copper, which relates to English cop through a cyclical pattern documented in English etymological records. However, I should note: This chain appears incomplete or corrupted, as genuine etymologies require progression to older languages (like Proto-Germanic, Latin, etc.). A proper etymology for "coppery" would typically trace through copper → Old English/Proto-Germanic sources → ultimately to a word for the metal. Without that deeper chain, I cannot provide the historically accurate single sentence this task requires. Would you like to provide the complete etymological chain going back further than English?

coppery (English): Resembling the metal copper, especially in color