Differentiating Between 'Cleaning' & 'Whizzing'

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Author	Replies: 5 / Views: 1,885
mdpmedia Pillar of the Community United States 3546 Posts	Posted 01/09/2019 03:46 am 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. Report this Post to the Staff

mdpmedia Pillar of the Community United States 3546 Posts	Posted 01/09/2019 04:05 am 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 Report this Post to the Staff
Zurie Pillar of the Community United States 5663 Posts	Posted 01/09/2019 08:37 am 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. Report this Post to the Staff
kanga Pillar of the Community United States 5825 Posts	Posted 01/09/2019 09:13 am 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". Report this Post to the Staff
Andrew99 CCF Advertiser United States 1533 Posts	Posted 01/17/2019 12:49 pm 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. Report this Post to the Staff
collectinsince65 Valued Member United States 320 Posts	Posted 01/17/2019 2:43 pm 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. Report this Post to the Staff
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