We use Ed's Red Plus for copper. It uses the regular ed's red formula plus some additions, we use the formula found on the internet:

"Ed’s Red
by Ed Harris

simple recepie: Ed's Red (home made): Equal parts of Mineral Spirits, Acetone, Kerosene, and Automatic Transmission Fluid.

CONTENTS: Ed's Red Bore Cleaner

1 part Dexron ATF, GM Spec. D-20265 or later.

1 part Kerosene - deodorized, K1

1 part Aliphatic Mineral Spirits

CAS #64741-49-9, or substitute "Stoddard Solvent", CAS #8052-41-3, or equivalent.

1 part Acetone, CAS #67-64-1.

(Optional 1 lb. of Lanolin, Anhydrous, USP per gallon, or OK to substitute Lanolin, Modified, Topical Lubricant, from the drug store)

MIXING INSTRUCTIONS:

Mix outdoors, in good ventilation. Use a clean 1 gallon metal, chemical-resistant, heavy gage PET or PVC plastic container. NFPA approved plastic gasoline storage containers are OK. Do NOT use HDPE, which is permeable, because the acetone will slowly evaporate. Acetone in ER will attack HDPE over time, causing the container to collapse, making a heck of a mess!

Add the ATF first. Use the empty container to measure the otherainer to measure the other components, so that it is thoroughly rinsed. If you incorporate the lanolin into the mixture, melt this carefully in a double boiler, taking precautions against fire. Pour the melted lanolin it into a larger container, rinsing the lanolin container with the bore cleaner mix, and stirring until it is all dissolved. I recommend diverting up to 4 ozs. per quart of the 50-50 ATF/kerosene mix to use as "ER-compatible" gun oil. This can be done without impairing the effectiveness of the remaining mix. Label and safety warnings follow:

FIREARM BORE CLEANER

CAUTION: FLAMMABLE MIXTURE -- HARMFUL IF SWALLOWED -- KEEP OUT OF REACH OF CHILDREN

Contents: petroleum distillates, surfactants, organometallic antioxidants and acetone.

1. Flammable mixture, keep away from heat, sparks or flame.

2. FIRST AID, If swallowed DO NOT induce vomiting, call physician immediately. In case of eye contact immediately flush thoroughly with water and call a physician. For skin contact wash thoroughly.

3. Use with adequate ventilation. Avoid breathing vapors or spray mist. It is a violation of Federal law to use this product in a manner inconsistent with itsonsistent with its labeling. Reports have associated repeated and prolonged occupational overexposure to solvents with permanent brain and nervous system damage. If using in closed armory vaults lacking forced air ventilation wear respiratory protection meeting NIOSH TC23C or equivalent. Keep container tightly closed when not in use.

INSTRUCTIONS FOR USE:

1. Open the firearm action and ensure the bore is clear. Cleaning is most effective when done while the barrel is still warm from firing. Saturate a cotton patch with bore cleaner, wrap or impale on jag and push it through the bore from breech to muzzle. The patch should be a snug fit. Let the first patch fall off and do not pull it back into the bore.

2. Wet a second patch, and similarly start it into the bore from the breech, this time scrubbing from the throat area forward in 4-5" strokes and gradually advancing until the patch emerges out the muzzle. Waiting approximately 1 minute to let the bore cleaner soak will improve its action.

3. For pitted, heavily carbon-fouled service rifles, leaded revolvers or neglected bores a bronze brush wet with bore cleaner may be used to remove stubborn deposits. This is unnecessary for smooth, target-grade barrels in routine use.

4. Use a final wet patch pushed straight through the bore to flush out loosened residue dissolved by Ed's Red. Let the patch fall off the jag without pulling it back into the bore. If you are finished firing, leaving the bore wet will protect it from rust for 1 year under average atmospheric conditions.

5. If lanolin is incorporated into the mixture, it will protect the firearm from rust for up to two years, even in a humid environment. (For longer storage use Lee Liquid Alox or Cosmolene). "ER" will readily remove hardened Alox or Cosmolene.

6. Wipe spilled Ed's Red from exterior surfaces before storing the gun. While Ed's Red is harmless to blue and nickel finishes, the acetone it contains is harmful to most wood finishes.

7. Before firing again, push two dry patches through the bore and dry the chamber, using a patch wrapped around a suitably sized brush or jag. First shot point of impact usually will not be disturbed by Ed's Red if the bore is cleaned as described.

8. I have determined to my satisfaction that when Ed's Red is used exclusively and thoroughly, that hot water cleaning is unnecessary after use of Pyrodex or military chlorate primers. However, if bores are not wiped between shots and shots and areand shots and are heavily caked from black powder fouling, hot water cleaning is recommended first to break up heavy fouling deposits. Water cleaning should be followed by a flush with Ed's Red to prevent after-rusting which could result from residual moisture. It is ALWAYS good practice to clean TWICE, TWO DAYS APART whenever using chlorate primed ammunition, just to make sure you get all the corrosive residue out.

This "Recipe" has been placed in the public domain, and may be freely distributed provided that it is done so in its entirely with all current revisions, instructions and safety warnings included herein, and that proper attribution is given to the author."

"Eds Red Plus

This variation on the Ed's Red formula gives it a copper removing ability similar to the commercial bore cleaner Marksman's Choice MC-7. You will need:

11 ounces of basic Ed's Red
2 ounces of 10%-20% industrial strength ammonia
2 ounces of Rustlick WS-11 cutting oil or suitable alternative
1 ounce of Murphy's Oil Soap

Mix the oil soap and ammonia in a separate container. In a suitable 1 pint container containing 11 ounces of Ed's Red, add the cutting oil and mix together. Then add the oil soap/ammonia mixture to Ed's Red/ cutting oil and shake the container to mix the ingredients. You will end up with a pink opaque liquid that for the most part remains in solution, but some components may settle out over an extended period. It is always best to shake well before using. The resulting solution will remove mild copper deposits in bores if allowed to work about 15-20 minutes.

Water soluble cutting oils and rust inhibitors can be obtained online from MSC Industrial Supply Co. or locally from your industrial supplier. NAPA auto stores carry a soluble oil listed as NAPA Soluble Cutting and Grinding Oil," part number SL SL2512. Metal screw top containers can be obtained from WASCO -- Wildlife Artist Supply Company under | Products | Molding and Casting | Containers, Cups and Tools."

Works great for copper removal. But we use a lot of it because we test a lot of weapons. So you might need to re-size the quantities some for your use. Like it says, it removes mild copper deposits in bores if allowed to work about 15-20 minutes, but if you let it work longer you can get rid of any heavy copper stuff too. We have a vat, we dump the parts in and go to lunch and then take them out later and copper comes right off and clean as can be.