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<p>[QUOTE=&quot;Conder101, post: 710307, member: 66&quot;]Because they DON&#039;T have three quarters of a century of experience.&nbsp; It has been over a quarter century since they have struck 95% copper cents and almost half a century since they have used this particular alloy.&nbsp; I&#039;m sure there is no one at the mint today with a clue as to how they cleaned and processed the cents back in the 50&#039;s and early 60&#039;s. The cleaning and burnishing solutions they use to remove the scale and oxides from the cent planchets after annealing have a large effect on how readily the coins will tone.&nbsp; Small changes in the alloy may also have a large effect (the removal of Tin in 1962)&nbsp; I&#039;m sure the mint does not have the same cleaning and burnishing solutions that they had back then, they may not even be available anymore.&nbsp; This means a lot of experimenting to find solutions available that DO work and provide tarnish protection for this alloy.&nbsp; The satin finish on the mint set coins may also render them much more likely to form tarnish because of the greatly increased number of potential reaction sites on the surface.[/QUOTE]</p><p><br /></p>

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