Does osmium tarnish? Does it corrode, rust and oxidize? No, osmium doesn’t tarnish. Osmium is a highly stable precious metal that doesn’t tarnish under any circumstances. Osmium is also very corrosion-resistant and immune to most substances you can throw at it. Only substances like chlorine and fluorine corrode osmium with long-enough exposure. Finally, osmium is … Read more

What are gold hallmarks? Is all gold hallmarked or not? What about gold jewelry and bullion? Learn it below! What are Gold Hallmarks? Gold hallmarks are tiny stamps or engravings on gold items that indicate the gold’s purity, origin, and authenticity. These markings provide proof of the gold’s purity and authenticity and help determine the … Read more

Does iridium tarnish? Does it rust, corrode and oxidize? No, iridium doesn’t tarnish. It’s one of the most corrosion-resistant metals known to mankind and is resistant to tarnish, even at high temperatures. Iridium is unaffected by air, water, and most acids. And while it can react with oxygen at high temperatures and form iridium dioxide, … Read more

Irish silver hallmarks are official stamps applied to silver items to certify their purity, origin, and date of manufacture. A complete Irish hallmark typically includes a maker’s mark (initials or logo), a fineness mark (such as 925 for sterling silver), an assay office mark (the crowned harp), and a date letter indicating the year of … Read more

Blue gold is a real but extremely rare gold alloy created by combining yellow gold with either indium (46% gold, 54% indium) or gallium (58.5% gold, 41.5% gallium). This results in 11-karat or 14-karat gold with a distinctive blue hue. Unlike natural gold, blue gold doesn’t occur in nature and is created in laboratories. Blue … Read more

Does ruthenium tarnish? No, ruthenium doesn’t tarnish. It’s a highly resistant metal, especially to corrosion and oxidation, even at high temperatures. Ruthenium’s resistance to tarnishing makes it a popular choice for various applications, including electrical contacts, resistors, and jewelry finishes. Ruthenium oxidizes at temperatures above 800°C. But this early oxidation forms a thin oxide layer … Read more

Ruthenium coins and bars… Do these exist? And what is black ruthenium exactly? Find out below! Here’s an awesome quiz about ruthenium-made coins and bars, including info about black ruthenium. Take this quiz after you’ve read my guide. What is Ruthenium? Ruthenium is a transition metal categorized within the Platinum Group, symbolized as Ru with … Read more

What’s a coin edge? What’s the purpose and meaning of it and why are some coin edges reeded and some smooth? Learn it all right below! Here’s an awesome quiz about coin edges based on this post. Take it after you’ve read this guide for your best results. What is a Coin Edge (Meaning and … Read more