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Differentiating Between 'cleaning' & 'whizzing'

 
 
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Pillar of the Community
United States
2641 Posts
 Posted 01/09/2019  03:46 am Show Profile   Bookmark this topic Add mdpmedia to your friends list Get a Link to this Message
Please specifically answer as many of the questions below:

1) Is whizzing only done with a high speed mechanical wire brush?

2) How can whizzing be distinguished from die polishing marks?

3) If it is determined that the scratches on a coin are only die polishing striations, can these types of anomalies appear on both the devices 'and' fields simultaneously:

a. or only on the fields?

b) or only on the devices?

4) How can whizzing be distinguished from cleaning if the purpose of the whizzing was the removal of crud vs the creation of a luster/cartwheel effect?

5) Are both cleaning and whizzing justification for a coin to receive a 'details' rating when encapsulated?

If anyone has additional comments pertinent to this thread, please place the comments here.
Pillar of the Community
United States
2641 Posts
 Posted 01/09/2019  04:05 am  Show Profile   Bookmark this reply Add mdpmedia to your friends list Get a Link to this Reply
Lets practice on this one; guess how the TPG marked the slab:



Here is the actual coin and auction results:

https://coins.ha.com/itm/three-cent...bnail-071515
Pillar of the Community
United States
1503 Posts
 Posted 01/09/2019  08:37 am  Show Profile   Bookmark this reply Add Zurie to your friends list Get a Link to this Reply
Die polishing lines should only be on the fields, and the lines are raised, unlike cleaning hairlines or whizzing. The straight lines on that Three Cent piece cross onto the devices, so not die polishing lines, but they might be planchet striations. They are too linear to be whizzing.
Pillar of the Community
United States
4023 Posts
 Posted 01/09/2019  09:13 am  Show Profile   Bookmark this reply Add kanga to your friends list Get a Link to this Reply

Quote:
Die polishing lines should only be on the fields, and the lines are raised, unlike cleaning hairlines or whizzing. The straight lines on that Three Cent piece cross onto the devices, so not die polishing lines, but they might be planchet striations. They are too linear to be whizzing.

I agree almost completely with this.
My only possible disagreement could be with the last statement.

"Planchet striations" are very possibly the source of the straight lines since this coin:
-- is small and coins struck on thin planchets often do not get fully struck
-- the metal is nickel alloy and the Mint was having difficulties early on getting full strikes on that metal hence "planchet striations" often remained.

Whizzing is one form of cleaning and was often done with a soft polishing wheel. A wire brush would be an extreme case.
The high speed used during whizzing often creates enough heat to melt a thin layer of a coin's surface and move the melted material to the side in the direction of rotation.
But with the nickel alloy that is unlikely.

The answer to 5) is a definite "yes".
Describe it as if there were no picture.
Picture it as if there were no description.
Pillar of the Community
United States
1442 Posts
 Posted 01/17/2019  12:49 pm  Show Profile   Check Andrew99's eBay Listings Bookmark this reply Add Andrew99 to your friends list Get a Link to this Reply
If you saw a whizzed coin in person, you would not ask this question. A whizzed coin glows like the heart of a thousand suns. It is so obviously artificial that even if you never saw one, you would recognize it. It looks nothing like a coin with die polish lines or a coin with normal friction hairlines. The luster does not cartwheel like a normal coin but seems to radiate from everywhere.
The collection is in your mind. Dispose of your albums and free your mind from the tyranny of holes.
Valued Member
United States
231 Posts
 Posted 01/17/2019  2:43 pm  Show Profile   Bookmark this reply Add collectinsince65 to your friends list Get a Link to this Reply
I will try to remember to post an image of the whizzed 1915 Lincoln cent that I unfortunately own. Metal was pushed to the sides of both the obverse and reverse with whatever high speed device that they used.
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