Of course plain water will not wash off patina or toning. The only coins that 'jumped' out were of very recent mintage and I did that prior to...
Correctamente Jody, The toning, film, patina, shading, etc. will not 'wash' off under the high pressure steam. All chemically acquired reactions...
Here's an interesting idea: take one of those SGS, MS70 coins carefully out of it's holder. Then submit it to one of the top three grading...
Thanks for the nice welcome ;) Basically, I was using the word patina as a naturally ocurring film usually caused by age or environmental...
What about using a commercial jewelry steam cleaner? There are no solvents used, just superheated distilled water. I've cleaned a few 'test'...
Separate names with a comma.