Today, as a more experienced coin collector, this is theonlymethod I use to clean coins. (But I never do this to a high-grade coin.) This works best on silver, but if you have a copper coin that has a lot of black in it, then this will help a little also. This was shown to...
2004]. These efflorescences, containing both copper and sulphur, occur during the display or storage of artefacts when they are exposed to reduced sulphur gas. More intriguing are the ‘brown spots’ that have been observed recently on gold coins and medals of the Coin Cabinet of the Kunsthisto...
copper123 --- Coin Hoarder 1,526 3,718 posts Gender:Male Location:manchester Interests:coins , holidays . pets . history,days out , etc PostedJune 28, 2021(edited) Interesting to see the 1845 large date farthing lightly cleaned with an estimate of £500 -£700 I have a similar if ...
By using some kind of grease, such as a layer ofVaseline, over the copper you can prevent copper corrosion. This isn’t suitable for all objects made of copper, but where you have copper pipes in the basement, for example, it can prove to be an excellent solution. You do need to mak...
Test treatments were carried out on archaeological objects: silver-plated copper alloy coins. The best post-treatment results in terms of efficiency and the overall aesthetic appearance of the object were obtained with physical peelable gels (Agar or gellan gum) containing a treatment solution (2鈥...
such as family heirlooms, silverware and service pieces, picture frames, coins, heck even silver bars. I tested a few techniques out but this one seems to be the magic combination. It can be used on all kinds of silver alloys, but cannot be used of other metals or costume jewelry. Silv...
Case study of silver-plated copper alloy coins. J. Cult. Herit. 2021, 52, 73–83. [Google Scholar] [CrossRef] Guilminot, E. The Use of Hydrogels in the Treatment of Metal Cultural Heritage Objects. Gels 2023, 9, 191. [Google Scholar] [CrossRef] [PubMed] Khaksar-Baghan, N.; ...