Reminds of me of my grad student days. Way back then before the Feds tightened the regs, it was easy and cheap to get 95% alcohol for lab use...
The topic of bitterants in acetone was covered extensively in a recent thread. See the link below. In short, some acetone sold in pharmacies...
A few other things to consider: 1. Population is growing and will continue to do so barring a catastrophe. Even if the percent of the...
Reagent grade acetone, as defined by ACS (see link) requires minimum 99.5% purity as far as acetone content goes. However, the nature of the 0.5%...
Makes sense. Cal
There are a number of ways of handling the ends of a data series with regard to averaging. Let's assume no data will be used before the start or...
Um, the average is should be in the middle regardless of the magnitude of ups and downs. The purpose of a moving average is to smooth the data so...
I'm a little suspicious about the moving average on the top chart. Except for a couple of brief intervals, the six month average is always above...
There was no code. The whole line is: 2 1 84316290 6280 1854-O 50C Arrows No Service/Not Holdered USA Link is below. Cal link:...
One thing I wish they would show is the type of submission: raw vs regrade/reconsideration vs cross-over. And for the latter two, show the...
Nice thread; glad you started it. I'd not looked at shared orders before. Can be a bit addictive. Saw a curious one though: 1854-O 50C Arrows,...
Go to Amazon and search reagent grade acetone. You'll want one that meets ACS specs (American Chemical Society; see link below). At present,...
Amazon and Home Depot. Cal
What law? Maybe a state or local pharmacy board law or reg. Definitely not required outside of pharmacies in Calif. (if there is, it's widely...
Maybe it's in the acetone you buy at your pharmacy. Not in the reagent grade or painter's grade that I buy. I never buy it at pharmacies. Cal
Not true. There aren't a lot of acetonolics out there; so no need to make the stuff nauseating. It's not particularly toxic either. Our bodies...
So, Doug, do you think the changes you saw when copper coins were treated with acetone were genuine chemical changes or due to removal of oil,...
Pure acetone won't hurt the coin and will remove PVC residue. However, if copper has a layer of oil on it, acetone will remove that as well so...
I've had Lincoln cents in Whitman folders do more than just tone. Some had active corrosion at the rims and edges. Wiped off the verdigris, put...
How else would coins retain quality germs? :yack: Cal
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