How do you dry a coin you have dipped?

You have some bad acetone!

 

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What gave you this idea? You can run a coin under water and pat it dry and no one will be the wiser.

 

It was probably 'bad' glass, contaminated with a film before the acetone.

 

EXPERIMENT: I needed to see for myself.

I just put a drop of medical grade acetone on some clean glass. It dried w/o a trace.

Next, I put a drop of the same chemical from a small batch in a different bottle that I dip my PVC contaminated Q-tips in. This left a spot.

Note: In the first case nothing was visible. In the second case I had to tip the glass at an angle under the light to see it. From this I believe that with a more contaminated sample the spot would show easier.

 

There is NOTHING left when pure acetone dissolves, you are plain wrong. As I've said a million times, rinsing with water rehydrates the coin inviting corrosion. In fact, even the highest grade water (~18MOhm)contains trace elements and gasses. By rinsing with water and drying, you're putting that stuff right back on the coin. Water is a very "dirty" substance because it absorbs almost everything. It's known as the "universal solvent" for a reason.

 

This has long been both my understanding and experience. In addition, it's also about the easiest way as well, at least as far as I'm concerned.

 

Reagent grade acetone dispensed from its original container will not leave a film in and of itself. If you are using painter's grade acetone or nail polish remover, it will have impurities in it. However, if an object has a film of a substance that can be affected by acetone other than completely dissolved, then spots or haze may appear. If the substance is very soluble in acetone and there is not much of it, then a quick rinse or dip will remove it. Examples: lubricating oils, petroleum jelly. If the substance is not very soluble in acetone, then short exposure to acetone may alter its appearance so that it become noticeable. Examples: PVC residue or doctoring putties.

It's also possible that a substance, like oil or grease, that is soluble in acetone could be on a coin and covering spots or roughness. Some coin doctors are experts in doing this, but it can happen innocently too. When the substance is removed with acetone, the spots or roughness reappear. It's easy to conclude that the acetone harmed the coin when all it did is reveal the true nature of the coin's surface.

Cal

 

Bad glass? How about a bad coin? I know where the glass has been, I don't know where the coin has been.

 

Maybe. I'll check it.

 

Any PURE solvent will evaporate completely without leaving any residue. Acetone evaporates quickly, but will chill the coin (because of the evaporation) and moisture could condense on it.

 

Hair blow dryer on hot. Does a perfect job and leaves no waterspouts and you are not in danger of hairlining your coin with any kind of cloth.

 

Water spots, sorry....

 

I'm not so sure about recommending this one... If you're happy with and feel it works best for you, that's great, but in certain instances I can see where this could easily cause more problems than it solves.

 

I need to post some pictures where I took cents and deposited drops of water and acetone on them and let it evaporate...interesting results.

 

Okay, I think I can synthesize all of these ideas:
Rinse the 'dipped' coin in distilled water, lean it against the countertop to dry, then rinse with acetone, let it dry for 5 seconds, and throw it in an airtite as FAST as I can, then double seal it up with this bad boy to keep it in a vacuum environment:

 

Not to play Devil's Advocate, Doug, but the plastic bag that mlov43 pictured is not only air-tight, but vacuum sealed.

 

As long as you don't live in california, here is a source probably as pure as you will find. It is listed as 100%, and has no other ingredients listed. About 3X more expensive than 'California available' solvent.
https://www.amazon.com/MG-Chemicals...e=UTF8&qid=1477077132&sr=1-1&keywords=acetone