1994-D Missing Copper Layer Or Plated?

Please see my first post on page 1 further down for a link and video, chemistry experiments used hot sodium hydroxide solution as an example to plate cents which was my secondary suggestion for this coin as mentioned there further down in the post if it turned out not to be a unplated zinc planchet. unplated Lincoln cents are difficult to authenticate in even the best of circumstances, even for grading services also as mentioned. Normally they are more greyish white like this one and I'm still learning like everyone else which is many times why I also post links to where I got the info from. https://www.coinworld.com/numismati...g-hobby.html

just throw a bunch of cents on the electric range top, set the temp to about halfway

turns them red, silver, grey, or gold. Vary the temp and time to tune the results