Penny for your thoughts

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That does look good, I really like it!
It doesn't appear that the people laying the floor down are using any kind of mortar mix. I imagine that would take some time to lay down.
Also did they cover it with some kind of finish to prevent oxidation of the pennies? I could just a person walking across the floor and coming off the floor with green feet.
 
@ultramatic

Pennies are sort-of a copper alloy. Until 1982, they were a 95% copper, 5% zinc alloy. Since then, they have been a 99.2 % , .8% copper alloy with pure copper on the outside.

I'd say they were not durable at all, without A LOT of urethane on them. A LOT of urethane.
 
If you look closely at the pennies on the installed floor it looks like they poured some kind of clear epoxy over the pennies. The gloss looks quite deep.

Also notice how the pennies have been lined up, each row is a straight line.

The link leads to instructions about how to do this...

 
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