Finally cool again.
On the coin, the tops of the devices the narrowest.
So on the die, (which is a negative) the tops of the devices are the deepest into the die. The fields on the coin is the lowest area on the coin. On the die the fields are the outside part of the die.

The incuse devices (EPU)on the coin actually raise above the fields. Note on the cent images.
So when the die gets any grease into the die, it prevents the devices from forming. The deepest part is the tops of the coins devices. (the die is a negative) Those devices are tapered so they will release after the strike. (imagine if they weren't, the first coin struck would be stuck onto the die) So when the die gets filled then nothing shows.
When a partial amount get into the devices, then you may see partial devices.


You coins die had some areas partial and other areas more filled. On the coin I posted is was almost blank because the was almost totally filled.
Edited by coop
08/20/2016 11:35 am