Hi. We do not have any experience using Barkeepers Friend, so we can't accurately answer your question.

Attached you will find some information regarding COPPER CARE:

The way to keep your copper sink in optimal condition is to keep it clean and dry. For basic cleaning, simply use a mild soap and water; other cleaners are not necessary. A good habit is to wipe the sink dry after each use, especially in hard water areas. For extra protection, products such as Renaissance Wax may be applied to the copper surface periodically. These seals will help maintain the luster of the copper and provide better water runoff.

Do not use corrosives such as chlorine or concentrated vinegar, abrasive cleaners or copper cleaners. To prevent discoloration or damage to the finish, avoid acidic substances (lemons, pineapples, citruses in general, ketchup, wine) left in contact with the copper surface. For example, when cutting acidic fruits let the water run so the fruit juices do not linger on the copper and thoroughly rinse the sink. These substances may remove the patina finish of a copper sink. However, if an acidic product removes some of the patina, do not worry the patina will naturally return over time – generally in a matter of days - and will once again match the surrounding area. During this period of re-patina, avoid waxing the sink.

For bathroom sinks try to avoid leaving toothpaste and liquid hand soaps - on the sink for extended periods of time and make sure you rinse and dry the sink well. Some of these soaps have very strong chemicals.

When using copper kitchen sinks it is very important not to place pots and pans extremely hot on the surface of the sink or leave them unattended – especially overnight - since the finish can be damaged or removed. But once again do not get discouraged since copper has an endless ability to regenerate the patina surface naturally. With regular use the copper will regain the patina finish and match the adjacent area.

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Yes, Barkeepers Friend will remove the patina finish.