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<p>[QUOTE=&quot;Spark1951, post: 2977916, member: 90692&quot;]Reverse electroplating a 1982-D copper LMC.&nbsp; I found this experiment on Pinterest, if anyone wants to go find it for themselves.</p><p><br /></p><p>It involves finding an old device wall transformer and crimping alligator clips to the ends.&nbsp; You immerse an old stainless steel spoon in a solution of CITRIC acid diluted with water and connect the positive clip to the spoon.&nbsp; I used 8 oz. tap water with the juice of 1/2 lemon as my solution.&nbsp; The negative clip attaches to the coin under test.</p><p><br /></p><p>Once immersed, you need to ensure the spoon and coin remain apart, then plug in the transformer into your wall outlet.&nbsp; My transformer output was 16 volts direct current (vdc) and was strong enough.&nbsp; 12 vdc is good too, weaker and you must run the test longer.&nbsp; There are pitfalls, but worth it if you are careful as you will see by my results.</p><p><br /></p><p>My original coin, lots of corrosion.&nbsp; The experiment is supposed to remove all non-metallic debris.</p><p>[ATTACH=full]732092[/ATTACH] </p><p>The coin will begin to fizz within a few seconds of plugging in the transformer, but the wires don&#039;t get hot or even warm.&nbsp; You must be careful attaching the clip to the coin to avoid adding contact marks.&nbsp; Here is after 30 minutes:</p><p>[ATTACH=full]732093[/ATTACH]</p><p>Next, after a total of one hour:</p><p>[ATTACH=full]732094[/ATTACH] </p><p>Next, 3 hours.&nbsp; Notice the halo effect where the clip was attached:</p><p>[ATTACH=full]732095[/ATTACH] </p><p>Final result after a light swab with acetone:</p><p>[ATTACH=full]732096[/ATTACH] </p><p>Honest...same coin.&nbsp; Acetone removed debris from the test including the halo.&nbsp; The only negatives were an additional new contact mark from the clip and the fact that it is now a cleaned coin.&nbsp; This coin was a sacrificial lamb to test the procedure, obviously it was not a &quot;keeper&quot;.&nbsp; I will keep it as a specimen.</p><p>&nbsp;&nbsp; Comments?[/QUOTE]</p><p><br /></p>

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