I am currently keeping my collection in a Leuchtturm Grande case with self-adhesive coin holders. But I am not happy with them because I want to...
Just opposite. It actually protects the silver. it is called the cathodic protection. Silver on gold, copper or iron on silver, lead on copper...
Great coins! I liked the Uljaytu 6 dirham! By the way qaaniks are no longer rare. In the last 2 years a hoard of 10.000 coins have been unearthed
Yes indeed. When a rare coin from Ilkhans shows up I start to sweat, my hands start to tremble :) And this month was exceptional, so many rare...
I would like to share few coins that I've added to my collection in the last month. I am pretty happy that almost all of them are all either rare...
I would love to try the app and give feedback!
Great coin! There not many ancient and medieval coin dealers in the Netherlands. Especially finding an Islamic coin is extremely hard. I generally...
41% still above the average. It should be below 35% to be on the safe side.
For the bronze disease treatment (and also corroded silver) you can refer to the following articles. [1] Oddy, W. A. and Hughes, M.J. Studies in...
Yes I live in the Netherlands. :)
Yes that is true near the sea. But the mechanism of formation is totally different.
I am afraid there are many wrong information in your post. Verdigris is copper carbonate or acetate and bronze disease is copper chloride. Here...
Here is an example of the bronze disease and the sesquicarbonate treatment on a rare Ilkhan fals. First image is taken just after I purchased the...
Quote from Wikipedia: "Natural or artificially created coatings of verdigris are commonly used as a patina to protect copper or bronze objects,...
It belongs to Ilkhans. Ilkhans, Abu Sa'id, AE Fals, Tabriz, 726 AH. (4.02g, 24 mm)
Sure I am using Adobe Photoshop in my workflow. But the image with the high contrast does not reflect the coin I have. I process the images in a...
Unfortunately it is not true. Please see the attached patent for the production of sesquicarbonate.
No. Exactly opposite. It can of course darken it but it is gentler than the sodium carbonate alone. Sodium sesquicarbonate is a a double salt of...
Let's clarify few things: 1) If it is verdigris, you don't need help. Verdigris is not harmful but a protective patina. If it was harmful, you...
I totally agree and that's what I was trying to say. Some are beautiful but really hard to capture that. And that's a beautiful photograph of a...
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