Isopropanol. 70% in, 91% (the azeotrope) out; how much you need? I'd never trust my lab technique enough to make something for ingestion. I...
Yep. It's not expensive. I've got gear suitable for distilling it, and in my younger days I probably would've tried that as an exercise -- but...
I bought an 1897-P Barber quarter much like yours, but even more harshly polished, for about 5 bucks on eBay last year (BIN). I photographed it...
Yeah, Doug's been the main spokesman here for the dangers of acetone on copper. I'm skeptical from a pure chemistry perspective, but I don't have...
I think that was more than just dipped. I suspect polishing.
Yes, but it's not the math at issue here. In college and grad school, I learned a lot about formal logic, formal verification, and reasoning...
I took the kids up to see my Dad last weekend (in Maryland), and took a spare hour or two to visit a couple of local stores. I drove out to...
Free listings are a pestilence on eBay. Sure, there are more millions of items "available" as a result -- but so. Much. Dreck.
Hope you don't mind, I pulled a copy of that adoption-curve image to post directly. [ATTACH] This is an interesting chart. But you know what I'd...
That's kind of the point. ;)
That's just because eBay these days is full of bargain hunters who don't appreciate true quality in coins. :rolleyes:
I've suggested this before, and been shot down quite firmly, but I'm compelled to point it out again: if moderators and administrators would allow...
Looks like I need to brush up on the high end of the circulated Barber grading scale again...
Fine, I'll take 53. :rolleyes:
I'm pretty sure you can't even see your own infraction count, never mind others'. If infraction counts were public, some people would treat it as...
The relevant statute prescribes fines and/or imprisonment for anyone who fraudulently "alters, defaces, mutilates, impairs,diminishes, falsifies,...
Imgur is an extremely well-known image-hosting site. You may not know for sure what image you'll get, but you can be pretty confident it'll be an...
I'm not especially good at spotting subtle differences in coin designs -- that's one reason I don't chase varieties -- but for some reason,...
Don't know what was showing when this thread was originally posted, but the images I see now are a clear fake. The date looks nothing like the...
Who also, I believe, touched on the issue of "how hard do you have to rub"...
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