Sintered planchette??

Is this a sintered planchette? Thanks guys

 

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No. Sintering is the process of heating and compressing metal powders to form a component.
Not sure what you mean?
After further consideration, I suspect you are referring to the heat treating and annealing process in the preparation of the coin blanks. See:

https://www.treasury.gov/about/education/Pages/manufacturing.aspx

 

The discoloring

 

They’re almost like a violet I guess the picture don’t really show it

 

No... the mint does not sinter - sintering is pressing a metal powder into a mold and then heating it to create a solid. Typically the solid is porous and that would make a poor process for creating a coin.

It just looks like environmental damage it was exposed to something, maybe a spray.


Lastly, the coin term is planchet, not planchette.

 

I believe the OP is referring to improper annealing. Such as is most often seen on "black beauty" nickels.

 

Thanks for info. Still learning the basics.