I'll always prefer a white background. For me, it's a point of reference. I use it to make mental corrections to images. Sometimes if you squint a...
I use a old, cheap Canon SD700IS and a good desk lamp. It's all about the light, angle of the light for me. Also the camera distance and angle. I...
Sexah!
@SuperDave, what happen with your project? I'd like to see some side-by-side before/after pictures.
Absolute FACT. Existing verdigris can provide feed materials to accelerate/induce corrosion elsewhere. That said, verdigris can also be made...
Here's mine, got in a trade with Bob Piazza himself: [ATTACH] [ATTACH] [ATTACH] [ATTACH] PCGS slabbed shows about $275 for 63RB. I wouldn't...
No analytical chemist in their right mind would say "yup, that's BZT". See the sample FTIR spectrum I posted. The S/N is very low and and not...
.....unless it's a high value coin and they suspect foul play.
No need for that, I produced a thick layer of BTZ. As you can see, the signals are barely above noise: [ATTACH]
The article is ~30 years old, check out their IR spectra and compare to a modern FTIR (mine above, 2 years old). LOLOLOL
WOW....nice find, these are tough! Looks to be AU, valuable coin! I traded several nice MS Morgans for mine. CONGRATS!
There is little value to a 1964 cent. You can go into most any coin shop and buy a really nice one for 25 cents or less.
Ran a quick experiment today on the FTIR-ATR. As I already knew, BZT produces a strong IR spectrum. I made a strong solution of BZT in methanol...
I've always considered metal-surface reactions as ionic not covalent. Nitrogen is a tricky thing, it does strange things with electrons. @Kentucky...
Benzotriazole/tolytriazole (isomeric mixture of triazoles) will remain on the surface after using a solution and drying. It's a pretty good...
Acetone Structure: [IMG] MEK [IMG][IMG] MEK is slightly less polar than acetone due to the addition of a methyl group. For coins, I don't...
Weak strike, love those frosty fields!
Why didn't he just go ahead and commit car theft, a rape and a murder in there so it sounds more complete?
Sounds just like the "Tribute Gold Buffalo" sold on TV! I'll convert for folks, that's a whopping 0.071g of silver about 81 cents worth.
I liked it better before cleaning.
Separate names with a comma.
