Error Lamination | 1961-D Lamination Error

[RWBILLER]

Hi:
Found this in a bank roll - lamination problem. Question: What causes a lamination?
Thanks
Roger

[CCC]

Roger,

I'm not sure about this one. The scratch marks, or lamination appear to be running congruent with each other.

[JeanK]

Paraphrase of explanation in "The Error Coin Encyclopedia" 4th edition, 'Lamination errors occur when a blank is made incorrectly. If there are impurities or foreign matter, gasses or other unintended material entrapped inside the metal when it was molten and poured into an ingot, the impurities will show up in the planchets, and will show up as surface defects. It can also be caused by slag or incorrectly mixed alloys'. Flaking and peeling of the coin's surface is an example.
Jean

[1sgret]

Great Book isn't it Jean? That describes it to a "T".

[JeanK]

Yep, this book is getting as dog-eared as my Daughtrey book.
I was very lucky to find it on the internet, new and shrink wrapped at the actual cover price.
Jean

[1sgret]

They are getting harder to find.

[coppercoins]

Jean got the definition down exactly, but I can add that these are most common in the wheat cents of the 1940s and the first five years or so of the memorial cents. Exactly why they are more common in these two eras I cannot say.