2001 P Sacagawea Experimental Rinse??

I also have a very nice 2000 D that is brown in color

 

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My opinion on this matter, unless you got it in that year, from a brand new roll of coins looking the way it did, I don't think it can be attributed as experimental rinse as opposed to environmental exposure.

if it's circulated and not in Mint State, I think it's going to be hard for anyone to classify it as experimental rinse as the only cause for the coloration.

when they attributed them in those years, they came from brand new rolls with a few exception coins with the coloration, everything else was bright and shiny and the mint confirmed they were testing anti spotting rinse which may have contributed to the coins taking on an off coloration.

So, possible? Yes. Likely? I don't know. Can it be attributed after spending two decades in circulation? I'm not so certain at all.

Maybe, they have a really unusual look, patina/texture to them, so maybe someone that has attributed them and seen some in person could determine if it's environmental or the experimental rinse.

there was an experimental rinse, it happened at Philadelphia late in the year 2000, the planchets were dumped into two hoppers afterwards one hopper was used for 2000Ps, the other was used early the next year for 2001Ps. this is documented as happening.

There's been One 2006 D attributed by Fred Weinberg in 2006 that I am aware of, no idea how it got to Denver, or why only one, so I'm kind of skeptical on that one being legit but it passed the expert test.... I've seen others that look like that 2006 D did since then slabbed and it's called Mis-annealed.

I wouldn't buy one, I'd be skeptical of any one offered that isn't authenticated and slabbed as such regardless if I was in the market for one.

 

Thank you John. I don't know anything about these coins. This is the first time I have had any coins that I have done any research in the experimental rinse. I will get some pictures of mine posted. Also plan on taking mine to my local coin dealer. But I am always looking for input as I am new at this hobby.