An Overview Of Sintered Planchets

I want to work Sintered Planchets into my IA 2027 paper but the problem is we may not have the scientific technology out there at least in the TPG world to make a correct assessment that something is sintered based on past blunders. Specifically, ''everything" once called sintered has either been proved to be improperly annealed, environmental damage (i.e., just some strange oxide formations on the coin's surface) or improperly cleaned. Its bonded contaminated metal on the surface that is then diffused into the metal surface say with a temperature rise in the annealing oven (i.e., some call it drums) which I concur but to verify this definition to a SINGLE COIN incredibly I still can't confirm just one example. This must occur IMO thru the manufacturing of planchets but it remains elusive. JPL

100% correct IMO Dearborn. There was in an old CCF thread where the writer in this scenario gave this scenario: we have Cents being made in this furnace annealing oven (drum). The process is completed. Then quarters are put in there to be annealed but the drum is still dirty from the cents so copper or more specifically lingering copper dust then adheres to the quarter surface via contamination and then in the SECOND step gets diffused (i.e., via a high temperature) into the quarter surface with copper dust creating this reddish surface. The writer forgot the second required diffusion step. Anyway = Theoretically - consider then If copper-rich dust from a previous cent-production run contaminated the drums before quarter blanks were introduced, the resulting quarters would likely show isolated copper-rich stains, patches, or streaks on the surface rather than a uniform color change across the entire coin if contamination occurred along with diffusion via high temperature environment. After annealing, these localized copper deposits could oxidize preferentially, producing reddish, brown, or dark spots on an otherwise normal copper-nickel clad surface.

In contrast, a true improperly annealed quarter would be expected to show a more continuous and systematic color progression, reflecting oxidation of the entire clad layer rather than localized contamination. So to me this is possible as a possible error coin. I guess then if possible can someone show me a numismatic item under this scenario. A sintered surface is characterized IMO if one exists by a rough, porous, granular, often orange-peel-like texture containing microscopic pits, voids, and evidence of incomplete bonding between metal particles rather than a smooth, fully consolidated metallic surface as in a IA coin. One dilemma that is a possibility is that these zinc cents with the the zinc core could also possibly create an orange peel type surface thru environmental exposure - possibly. The zinc core cents IMO may not be the best candidates to illustrate a sintered planchet. I guess what I am looking for is to bring a high confidence sintered planchet candidate in the analysis pool with some Black Beauties and other candidates in 2027 for this IA paper. It looks grim and dim at this point. Just reaching out for a strong candidate. JPL

Improperly annealed. This will be scientifically verified in 2027 in my paper.