NGC verbiage (found on cert verification of copper coins):
“Copper Coins Notice: Coins made of copper, bronze, brass or are copper-plated can change over time. Accordingly, with regard to copper, bronze, brass or copper-plated coins graded by NGC, the grade portion will no longer apply after the 10 year anniversary of their date of encapsulation by NGC. This coin was encapsulated on [date encapsulated] and the grade guarantee will expire on [expiration date]. If the grade guarantee has not expired, it may be extended by submitting the coin under NGC’s ReHolder service tier. If the grade guarantee has expired, the coin will be treated as a raw (ungraded) submission if resubmitted to NGC.”
PCGS verbiage:
“IMPORTANT: Because the color and surfaces of copper coins can change due to environmental factors, including weather and improper storage, PCGS does not guarantee against changes in the color of copper coins, or against copper spotting subsequent to grading and encapsulation by PCGS.”
https://www.pcgs.com/guarantee
Statement regarding the 2009 update:
“We’ve also made a change in how we handle the guarantee of color for copper coins. The fact is that color for copper can change depending upon where a coin is stored. The villain is humidity, and if you have mint red copper coins stored in Hawaii or Florida, for example, there’s a good chance that the environmental factors can alter the color of the coins. This is obviously beyond our control so consequently we will not be guaranteeing the color of copper coins graded or sold after January 1, 2010.”
https://www.pcgs.com/news/pcgs-grading-guarantee-update
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