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While checking
the coins today, I noticed that there were small pinhead sized spots where
patina was being removed, so I stopped this experiment. Another 48 hours
had passed. Coins had lost another 0.4grams.
Dirt and encrustation was being removed, but it seems that the patinas were
also being weakened. I toothbrushed, silver brushed and 6 micron'ed the
coins, and this is what they look like.
It's not a complete failure, for I only notice this loss of patina on 2
coins... or perhaps it was there but was covered up. It was more involved
and time consuming than I first expected, as well as slower... so I'm done
with this particular experiment. My last experiment with the crockpot (for
now) follows below. |
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I pulled some
of the more problem coins and tried adding lemon juice in with the mixture.
I had decent results in my first experiments soaking at room temperature.
The coins weighed 14.5g collectively, and after 10 hours, weigh 14.2g. So...
a bit was removed, and quite a bit faster than without the lemon juice.
BUT during the 10 hours I was at work, the chemical reaction went a bit
further than I expected and solidified much of the solution and burnt. The
smell is worse than a 10 day old dead skunk. I wouldn't try this indoors.
Before scans first, after second.
My next experiment with the crockpot (if it's still usable) will be with
TSP. |
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