![](https://cleaningancientcoins.com/wp-content/uploads/2023/08/tacitcus_obv-transformed.png)
I purchased this coin as part of a larger lot of random bronze artifacts from various periods. Most of it was junk, but there were some interesting pieces. I purchased in part because of the Tacitus Double Denarius which was identified by a fellow roman coin enjoyer in a forum that I posted to.
![](http://cleaningancientcoins.com/wp-content/uploads/2023/08/image-1-1024x768.png)
![](http://cleaningancientcoins.com/wp-content/uploads/2023/08/image-768x1024.png)
Below are photos of the Antoninianus (Double Denarius) are taken under microscope. When I saw these photos it becomes clear the extent of the green rock deposits and dirt embedded onto the surfaces of the coin.
![](http://cleaningancientcoins.com/wp-content/uploads/2023/08/tacitcus_obv-transformed-1-1024x881.png)
![](http://cleaningancientcoins.com/wp-content/uploads/2023/08/tacitcus_rev-transformed-1024x895.png)
I started by spending some time looking at the surfaces under microscope from different angles to better understand how to remove it.
I decided that it was too impacted for immediate removal, so I opted for soaking in distilled water. The first soak was 3 weeks.
After Photos
![](http://cleaningancientcoins.com/wp-content/uploads/2023/08/final-transformed-1024x893.png)
![](http://cleaningancientcoins.com/wp-content/uploads/2023/08/done_rev-transformed-1024x901.png)