A technical question on toning

spoon

A question for our toning experts (lightsiders too): What is a technical explanation for how/why toning does not appear above the letters in examples like the one below?

I've seen several coins like this over the years, I imagine it is a sign of "natural toning". This example was so prounounced, though, that it prompted me to ask this question.

(For those interested, the coin below comes from a Romanian pattern set at auction by Heritage.)

1960NYGiants

Nice looking coin. Is the rev toned the same way / color / pattern?

MacCrimmon

Spectrum discussion explains color and the "pull back" around the legends

Also, take a look at Sunnywood's Morgans from either last Sat. or Sun. All naturale' and nice.

koincollect

Thanks MacCrimmon for digging that out. I was also wondering why this happens.

spoon

Excellent thread! Thanks for the referral Mac!

7Jaguars

I too appreciate the discussion, but think there must also be other factors at work as there should be other sites near to other devices that would exhibit this metal "stretch" phenom like near to noses, forheads, hairbuns, etc. It is not uniformly seen near to these however...

spoon

I think in several cases the effect is visible nearer the center. The medal below is mostly text, but it does show the effect much more dramatically and a lot closer to center.

spoon

This thread has become a hobby in its own... now I'm running into examples of this all over the place!

German at Goldberg's

This one reminds me more of the phenomena of the zinc penny in the souvenir elongator.