Hey @Insider, are you sure what's going on with clad coins in a commercial dip isn't just acid washing? Is the thiourea even taking part? I think that may be it. You can get whatever you're getting on cupronickel from the acid component, and without the thiourea, you might not have to deal with the pink copper problem. Careful modulation of the strength of the acid seems wise.
I'm not a chemist. If I want to know what's in dip I can look it up. There are people in our hobby who have developed/modified chemical formulations for their own use. I am not one of them. I use different off-the-shelf stuff. If it works on junk during experimentation, I keep it around. Folks who have no clue make fun of mayonnaise, ketchup, urine, etc. What they don't know frustrates me to no end but cannot hurt me. We all know what they say about opinions (especially those based on no actual experience)!
Well I can tell you that any product that takes off sulfide "tarnish" or toning from silver coins has two active ingredients - an acid and thiourea. Which acid? Really doesn't matter much. The thiourea is the thing for silver. The acids might "sparkle up" cupronickel all by their lonesome. It's something I now feel compelled to play with. Oh, stay away from cat urine on copper. Wasn't my decision; it was the cat's.
A lot of bloviating over a coin halfway into the grave. Just dip it! Or if its silver do the baking powder aluminum foil electrolysis first.
I disagree. The coin market considers color to be desirable at the moment. It is difficult to find recently made ones with any. Whether AT or NT, IMO someone will pay a decent premium for this coin in the condition it will look like after a tiny amount of proper conservation. Dip it and it is just an ugly dime. The only "bloviating" occurred when someone with no experience at all using certain chemicals refuted a tried-and-true practice.
Yes, well "tried and true" isn't "right". I WRITE MSD sheets, I don't READ them written by others. If I don't know what I put in it and why I did, I don't use it. I also grow and can my own veggies. Advice: never do "dip" mixing and canning brine mixing on the same day. My two recipes have an item in common - powdered citric acid.
Just because one CAN do a thing, that doesn't imply one SHOULD. Selling that monstrosity to a bidiot on eBay is a serious breach of ethics. Before anyone protests, yes, you DO STILL have ethics in this modern coin field, mostly observed in the breach thereof. But don't feel too bad. America's top business schools forgot to teach ethics too.
Come on guys, we have an ugly coin that has no chance of being saved. If the person is a newbie and needs practice with dip, dip it. If the person knows how to dip or doesn't want to try, spend it. We've taken a simple question and really beat it to death.