Have you tried the chemical MS-70?

There is a discussion about removing PVC from a silver coin in another thread: "8 hours in acetone and the green PVC is still there" I use MS-70. Have you tried it?

 

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First, I put nothing in acetone for 8 hours.

Second, yes.

 

I have not tried this product. How do you use it? Maybe expand on what GDJMSP said. I have really only used acetone to remove the muck off coins. I have a couple coins with haze. So, this product may help me.

 

MS-70 must be washed off first with hot soapy water. Best done using a heated ultrasonic cleaner (if you can afford one) for each of the steps quoted above.

 

If MS70 is used on copper and turns it blue, can you easily undo it? Do you have to dip it again with something else?

 

Yes. No. Wish I knew.

MS-70 will combine with some particular unseen chemical residues on the copper coin (usually acetone) and turn it blue. Formally, this color was rejected by TPGS as a chemical alteration (artificial color). In recent years the iridescent blue color has become marked acceptable and "prized" especially on proofs.

 

GDJMSP posted: "Must ?" Yes, must if you wish to do a professional job. "I sure never have" That's because neither of us are professional conservators! ", and I've used it plenty of times. In fact I strongly advise against using soap on a coin at all because soap is one of the hardest things there is to get all the residue off a coin." Actually, the deionized water used by professionals works very well. Hot distilled water does also. "Yeah, it can be done, but some other chemical is required."

"Yes, of course it can. And yes you have to dip it again." I disagree. "But dipping copper is special, not easy." And it is not done with the stuff we all have heard of. Unfortunately, the guys who do it at NCS have signed confidentially agreements so their lips are sealed. The evidence, namely the mere existence of so very, very, many Red coins clearly indicates that it can be done. But it aint easy ! And no, I will absolutely not explain how." See! I always suspected Doug wrote the instruction book for the first conservation service!

 

Just a quick nod and props to GDJMSP. I was so glad to see that you jumped in and took the time to actually teach insider a bit. People who leave "non-answers" to legitimate questions do more harm than good. Thanks for your help, wisdom, and time.
Jack

 

He may have jumped in, but chances are you will never teach insider anything.

 

Note to Jack: I'm the OP on this thread. I'm trying to learn new things with my post. I'm glad Doug and others have added their two cents.

Shortly after I joined CT, I was advised in no uncertain terms to stop badgering a member by requesting he answer a specific question I asked about the misinformation he made-up that the U.S. Mint had a way of detecting spots on their product along the assembly line. Bottom line, I learned that none of us is required to answer questions here no matter what we post. Nevertheless, I believe I gave the questioner some hints he could pursue. Furthermore, I'm not in the business of educating possible coin doctors who may read CT posts.

Finally, why don't you ask Doug to tell us what he does to turn copper red!

 

Hey Mike, I learn stuff every day. Example: Just today your recent post about the "D" mint marks (being added to the dies at the Denver Mint IGNORE THIS AS IT IS MISINFORMATION)has put me in contact with a mint historian (phone # and Email ) who has been teaching me many things I never considered or learned about coin production in spite of reading several books on the subject and visiting the mints.

Thank You!

 

http://www.translinesupply.com/PDF/MDSSHEETS/MS707530.MSDS.pdf

 

Insider - If you're happy, I'm happy. It doesn't change my opinion. Non-answers to legitimate questions are unnecessary, unhelpful, uninformative, and don't move the hobby forward. Such answers serve no purpose for me. You are correct, we have no mandate to answer questions.

MIkenoodle - point taken!

Best regards,
Jack

 

Not sure I have ever "moved the hobby forward".

 

I moved the hobby forward when I didn't run for the ANA Presidency!

 

Insider, you've successfully converted me to MS70. I will use on on the crummy Morgan in question because it's not worth much anyways. It's my guinea pig to figure out how to remove a geeen spot on the back of a higher grade 1904-O. Which isn't worth that much anyways but is my only partial PL coin.

 

I can only assume there's more to this with Insider than meets the eye, and wish avoid getting involved. However, I'm curious as to what you consider/believe a "non-answer" to be?

I ask only because I can think of many cases where, as an example, answering a question with a question has the potential to do more good than simply handing someone the answer. Doing so often promotes the individual to actually think for themselves. To me this would reasonably fall under the "non answer" category, yet it's hard to argue that thinking for one's self is anything other than necessary, helpful, and indeed moves the hobby forward. Depending on the situation, it could also be argued that it is informative as well.