Nice example. Without looking at the coin in-hand, and assuming it is not an incredible rarity that was not PF-70 before, I think you did a good job. Now if you continue treatment until the coin is blast-white and the details tend to fade against the background, I would call that harshly cleaned. However what you did looks good. Now, how many people looking at the second (cleaned) picture would turn up their noses and say that it is cleaned?
I'm not sure of this actually. I think coins are supposed to be naturally toned according to its age.
D.T Menace replied to: It must be what A.J. is talking about, there has been a shift on acceptability of cleaning. DT said: I would hope not Read more: http://www.cointalk.com/t205352-25/#ixzz1y0zCd382 What I meant is a long time ago it may have been acceptable or something to clean coins but it is no longer acceptable.
Thought I answered that question in my post #340. But I'll repeat it - yes. Even the guy who made the video agrees with me. As I said several times - you draw the line exactly at the point where what you do to the coin, does no harm to the coin. If it harms the coin it is harsh cleaning. If it does not harm the coin it is not harsh cleaning. The numismatic community agrees with those comments.
Cleaning anything does damage to it. Not cleaning something also damages it. All conservation eventually becomes restoration.
Well, if he defines light vs. harsh by whether it harms the coin, then light does not harm the coin (by his definition). But you're right, an explanation for "harm" is required to understand where he is drawing the line between the two. I think that GD's opinion of light cleaning includes nonabrasive removal of foreign matter (dirt, oil, debris) from the coin's surfaces, and anything beyond that is harsh. So, this definition negates any approach that would have any effect on the actual appearance of the coin itself. In summary, there are zero options for improving the appearance of a coin that is not harsh cleaning.
Examples? I suppose dipping may be on the list. I have read posts where you condone dipping, and you specify that it must be done properly. But what confuses me is the fact that dipping does exactly the same thing as the process that I applied to my quarter, it reacts with tarnish. If a coin is damaged by overdipping, or damaged by the process that I applied, then ANY dipping causes damage to the coin. The definition of harsh cleaning can't be characterized by "damage" and "no damage" if the definition of damage is based on a measure of degree.
Examples ? I've explained it many times. A coin can be soaked in distilled water until dirt and grime is rinsed away. No harm is done to the coin. Soaking a coin in acetone can remove some things from coins, and no harm is done to the coin. Same for xylene. The method you used (the one described in the video) causes light pitting on the coin, pitting is damage. Dipping a coin properly, causes no damage. Nobody, not the best expert in the world, can find any damage on a coin that has been dipped properly. But virtually anybody who knows coins, can see the damage caused by electrolysis - the method in the video.
That isn't really drawing a line, it's circular reasoning. As somebody just said above, what does it mean to harm a coin? "Harsh" cleaning or "harming" a coin is in the eye of the beholder. Do the oils on the skin "harm" a coin? Is acetone a "harsh" cleaning agent? What about distilled water? Even the smallest exposure to touch or friction or even light can cause microscopic changes to the surface of a coin.