How do you tell if cobalt blue glass is real or a replica?
I have found candle holders they have bubbles in them and vases hand blown also with the initials CCB on the bottom of vases with numbers 1-5.
"Real"? Do you mean "Are old originals or modern duplicates"? Cobalt blue glass is one of the easiest colors to make in glass and has been made for centuries. You need to track the markings at glass collector sites or in reference books.
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