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Elements last won the day on June 8 2018

Elements had the most liked content!

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About Elements

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  1. Excellent that’s what I learnt. Good job well done!
  2. What language are you using? I’ve just recently learnt how to scrape info from websites using python.
  3. The article suggests bonds as an alternative to stocks and a higher weighting of bonds if you want to be more conservative. Normally I’d agree but bonds and stocks seem to have gone up together, QE seems to have skewed things, so many junk bonds are low yielding, hence are bonds really a hedge to stock market crash? I don’t really want a heavy cash holding and would rather be invested. ATM I prefer selected value stocks like your other high yield thread but I still find myself cash heavy. Buffet seems to be similarly cash heavy (I in no way compare myself to him! But it really isn’t like him not to be invested). Interesting times
  4. my source of price info is pretty much the same as @h103efa has shown. Using those together gives a good estimate
  5. Yeah I agree. Dealers paying about £270 for a full. I’d say on here you’d probably expect to get between spot and best value from a dealer like Hatton so currently between £275 and £285. https://www.hattongardenmetals.com/buy/gold-sovereign
  6. @terakris Hi Kris, Not one I really was going to sell and I’m not really interested in the swap but I do have an ngc £2 PF70 I’d be willing to sell for £1200
  7. This was the thread I was referring to earlier. Similar chemistry but solid state silver polish isn’t kind to coins! https://oureverydaylife.com/silver-polish-ingredients-12337531.html
  8. The nitric wasn’t hot but was conc. I then tried conc HCl. After both I looked but didn’t take photos to post but i could see lots of spots still, although some had been removed. Maybe longer may have completely removed them. If I find another test coin I can try again
  9. I want to know why nitric on its own didn’t work. It did some, but not as good as the reduction. Could simply be a case of not left long enough
  10. No acetone won’t do anything to the spots. Pretty good at removing fingerprints though. I’d also like to know what they do
  11. see these academic papers. XPS is a great analytical instrument but prohibitively expensive bit of kit It and other techniques likely point to silver sulfide, but can’t rule out copper oxide. https://www.zlate-cihly.cz/Red_dot_on_coins_surface.pdf https://www.researchgate.net/profile/Saulius_Kaciulis/publication/234224608_Gold_corrosion_red_stains_on_a_gold_Austrian_Ducat/links/0deec52deb060ed2a1000000/Gold-corrosion-red-stains-on-a-gold-Austrian-Ducat.pdf?origin=publication_detail https://www.sciencedirect.com/science/article/abs/pii/S0168583X12007987 https://www.sciencedirect.com/science/article/pii/S1001052107600308 The chemistry is similar to that well known for removing tarnish from silver coins, since the tarnish is likely Ag2S in both cases looking at the above research papers (even if it’s copper the same process works) a similar treatment should and did work. To find out why the chemistry behind the silver tarnish removal (and similar process here) I point you to redox potentials of the reactions: Cu2O(s)+H2O+2e- <—> 2Cu(s)+OH- -0.36 Al3+ + 3e- <—> Al(s) -1.662 Ag2S(s) + 2e- <—> 2Ag(s)+ S2-(aq) -0.69 The more negative the potential the more the equilibrium lies to the left. Since Al can easily donate electrons to either silver sulfide or copper oxide it can reduce either. Another forum member did this recently on his libertad and worked, the above is the reason why. @Serendipity
  12. Yes I considered this. I ended up reducing the Ag or Cu whatever it was. That would take it back to as struck. But then the reduced reactive elements I stripped away. Otherwise the spots would almost certainly come back I think. As I noted at the start I wouldn't do this on any numismatic coin!
  13. After: Not perfect but almost all spots removed. With more time maybe I could completely remove them
  14. @tallthinkev @kimchi @richatthecroft @JunkBond @Pete @sovereignsteve I tagged a few who’d shown interest in this topic in this and other similar threads. Thanks to tallthinkev for providing the perfect nasty proof for this experiment! It had everything, fingerprint, spots and scratches!! Brilliant! The fingerprints were easy but the spots were more of a challenge. I’ll discuss more later but it wasn’t as easy as imagined. I though dunk in nitric or hydrochloric...job done. But that only removed a portion. I had to try something else. Even now it isn’t perfect, something remains on the knee and by the 1 of the 1979 date." Before: