aswimmer toned Morgans on eBay, Real or AT??
jamesfsm
Posts: 652 ✭✭
There is an eBay seller, "aswimmer," who sells very similar toned Morgans (i.e., they all look alike) that often look "chemically" to me. His feedback is good. Could the experts peruse his wares and opine to the less knowledgeable of us??
0
Comments
Russ, NCNE
AT!!!
No doubt this person has good feedback because the bidders are not very knowledgable.
In honor of the memory of Cpl. Michael E. Thompson
In honor of the memory of Cpl. Michael E. Thompson
Download and save those images as they'll be of help in the future.
GSAGUY
Russ, NCNE
Here is a nice little Barber that is both AT, ugly and engraved with the new "pompadour" look!
1913-S engraved
Just goes to show that Ebay feedback doesn't say much!
Tyler
Russ, NCNE
Russ, NCNE
JMHO
Lincoln Wheats (1909 - 1958) Basic Set - Always Interested in Upgrading!
There I broke the ice, now I feel better.
<< <i>I'll say one thing for this seller, he responds VERY quickly to eMail. He assures me that these are NOT AT, that they were in his Grandpa's collection and that the toning happened over a long period of time.
Russ, NCNE >>
...........yea, sure, and his grandma was the queen of england, and iam the duke of earl
Russ, NCNE
<< <i>You guys mean he may not have been truthful with me?
Russ, NCNE >>
............russ put on another pot of coffee, ill be right over
Item 1
Item 2
Item 3
Item 4
Item 5
Item 6
Item 7
Item 8
Item 9
Bwuahahahahahahahahahahahahaha!!!!!!!! You the man!
Russ, NCNE
mo <><
** I would take a shack on the Rock over a castle in the sand !! **
Don't take life so seriously...nobody gets out alive.
ALL VALLEY COIN AND JEWELRY
28480 B OLD TOWN FRONT ST
TEMECULA, CA 92590
(951) 757-0334
www.allvalleycoinandjewelry.com
No, I'm so disillusioned and distraught that somebody would actually lie to me that I just wouldn't be able to send another eMail.
Russ, NCNE
Were you Colombo in a former life?
GSAGUY
People like this really tick me off. It has become almost impossible to sell nice raw toned coins. I am having a real difficult time with a few nicely toned Morgans that really should not have lasted long at what I offered them for. I hope this clown accidently sticks his hand on that hotplate when he has it cranked up to 500c.
Great spirits have always encountered violent opposition from mediocre minds.-Albert Einstein
Thanks
Allen
Proud member of TCCS!
I am a chemist by training and it is my expert opinion that none of the following 7 chemicals that this guy purchased has any affect on silver or any other prescious metal. There are no sulfide compounds here only sulfate which is not the same thing or even close to it.
1. Ammonium Dichromate is a precursor to the manufacture of chromium dioxide - a superior quality magnetic media compound used in the production of high fidelity audio, data and video tapes. Is is also used in chemistry classes to show the reaction between two chemicals. Called the Ammonium Dichromate Volcano it subtly illustrates what happens when a chemical reaction becomes violent.
2. Ammonium Persulfate crystals are used as an alternative to traditional ferric chloride solutions for copper etching. Its used in the electronics field to etch circut boards. ALso used to clean corroded copper wiring and connections in motors and switches.
3. Potassium Permanganate and fish disease. Potassium permanganate, KMnO 4 , is a chemical oxidizing agent that will react with any organic matter in a pond including algae, bacteria, fish, particulate and dissolved organic, and organic bottom sediments. It has been used in fish ponds to treat common fish pathogens such as gill parasites and external bacterial and fungal infections. Contrary to some reports, potassium permanganate does not add significant amounts of oxygen to water and can actually decrease dissolved oxygen concentrations by killing algae that produce much of the oxygen in ponds.
Potassium permanganate is a useful fish disease treatment; acting against a range of protozoan parasites including Trichodina, Costia and Chilodonella, as well as monogenean flukes Gyrodactylus (skin flukes) and Dactylogyrus (gill flukes). In addition to being an effective anti-parasite treatment, potassium permanganate can also assist with bacterial gill disease and bacterial disease such as skin ulcers. It will also oxidise dissolved organic matter, reducing the biological oxygen demand and improving water quality and clarity. All sounds too good to be true!
4. Ammonium Flouride. It is used as glass etchant, polishing agent of metal surface, wood preservative, aseptic and disinfector in brewing, textile mordant and analytical reagent. It is also used for extraction of rare elements Application: It is used in welding flux, toothpaste additive, preservative, bactericide, slagging medium of metallurgy, adhesive, papermaking and construction industry.
5. AMMONIUM SULFATE is used as a fertilizer see http://www.sulfn.com/
6. Bromoacetanilide. This is used in college chemistry courses to show a chemical reaction and atomic level changes that occur when p-Bromoacetanilide is derived from Acetanilide.
7. Methylaminophenol Sulfate (Metol) belongs to the group of photographic chemicals. It is mainly used
in developers for black-and-white photos
the hot plate and oven are often used by college student to heat coffee or soup and the oven is used to
warm pizzas or other small frozen things or to heat up leftovers.
From what I see there would be a couple of logical explanantions that would account for the purchase of these. If the following facts were true and they are not that hard to fathom, then it would account for all of these items.
a. a student taking a chemistry course or who is interested in chemistry as a hobby
b. an aquarium or Koi pond
c. a photographer who uses a darkroom, probably a professional
d. someone has a horse or other farm animal (also can make explosives)
e. a college student in a room without a kitchen attached, ie. dorm or fraternity/sorority
I sumize by suggesting that the above list of chemicals he bought has no effect on silver and would produce no results like the toning or oxidation of silver. I conclude that these ebay purchases do not constitute the smoking gun many of you had already determined. I am sorry I could not confirm your theory but the facts act as a bright light illuminating the truth and debunking unfounded theories and opinions which seem to take on a life of their own here or in any forum like this.
Thank you for your time,
Albert Lundgren
toadstool1@boxfrog.com
on d. AMMONIUM SULFATE is not animal feed but plant food. Thus it should read "plants or crops need to be fertilized." It should not refer to having a horse or other farm animal.
Albert
Russ, NCNE
Albert
Dan
Dr. Albert Lundgren
Albert,is it your opinion that ANY of those seven chemicals in COMBINATION with OTHER CHEMICALS,some of which may not be on the "list",and HEAT will have an effect on silver?
I'm not shouting at you with the CAPS...
Great spirits have always encountered violent opposition from mediocre minds.-Albert Einstein
You have nothing to apologize for! You're new, you don't know how warped I am.
Russ, NCNE
GSAGUY
Liberty: Parent of Science & Industry
Albert
Pass the vomit bag
THE SULFUR CYCLE
I. The Sulfur Cycle
An important distinction between cycling of sulfur and cycling of nitrogen and carbon is that sulfur is "already fixed". That is, plenty of sulfate anions (SO42-) are available for living organisms to utilize. By contrast, the major biological reservoirs of nitrogen atoms (N2) and carbon atoms (CO2) are gases that must be pulled out of the atmosphere.
Overview: Important reactions of the sulfur cycle (Figure 17.35) include:
Assimilative sulfate reduction - sulfate (SO42-) is reduced to organic sulfhydryl groups (R-SH) by plants, fungi and various prokaryotes. The oxidation states of sulfur are +6 in sulfate and -2 in R-SH.
Desulfuration - organic molecules containing sulfur can be desulfurated, producing hydrogen sulfide gas (H2S), oxidation state = -2. Note the similarity to deamination.
Oxidation of hydrogen sulfide produces elemental sulfur (So), oxidation state = 0. This reaction is done by the photosynthetic green and purple sulfur bacteria and some chemolithotrophs.
Further oxidation of elemental sulfur by sulfur oxidizers produces sulfate.
Dissimilative sulfur reduction - elemental sulfur can be reduced to hydrogen sulfide.
Dissimilative sulfate reduction - sulfate reducers generate hydrogen sulfide from sulfate.
Reservoirs of sulfur atoms:
The largest physical reservoir is the Earth's crust wherein sulfur is found in gypsum (CaSO4) and pyrite (FeS2).
The largest reservoir of biological useful sulfur is found in the ocean as sulfate anions (very concentrated at 2.6 g/L), dissolved hydrogen sulfide gas, and elemental sulfur.
Other reservoirs include:
Freshwater - contains sulfate, hydrogen sulfide and elemental sulfur;
Land - contains sulfate;
Atmosphere - contains sulfur oxide (SO2) and methane sulfonic acid (CH3SO3-); volcanic activity releases some hydrogen sulfide into the air.
A. Given that Sulfur Is "Already Fixed", Why Bother Studying the Sulfur Cycle?
1. Environmental impacts are diverse and important locally even on a human time scale:
a. Some of the reactions that occur in the sulfur cycle open up new environments to life. They support biological communities in unlikely places such as deep sea thermal vents, areas of low pH and areas of high temperature.
b. On the other hand, certain reactions remove needed metabolites or produce wastes that make environments uninhabitable to some organisms.
2. Interesting microbial chemistries, that no other organisms do, are found in cycles such as the sulfur cycle. They have been exploited in:
a. Mining,
b. Bioremediation,
c. Synthesis of industrial chemicals.
B. Sulfur Oxidation
1. The light-induced oxidation of hydrogen sulfide for harvesting electrons during photosynthesis has already been discussed:
H2S -----> So + 2 H++ 2 e-
a. Organisms? The green and purple sulfur bacteria oxidize hydrogen sulfide for photosynthesis.
b. Habitats?
(i) Obviously, these organisms must live in the light. Therefore they cannot exist deep in the oceans where light does not penetrate.
(ii) The environment must contain a source of hydrogen sulfide, usually arising from desulfuration of decaying organic material or from sulfate reduction.
e.g. These organisms are often found in waters "one level" above decaying organics or sulfate reducers where they acquire hydrogen sulfide bubbling up from below and are simultaneously illuminated by the sunlight.
2. Chemolithotrophic oxidation of hydrogen sulfide generates energy:
a. Hydrogen sulfide can be oxidized to elemental sulfur:
H2S + 1/2 O2 -----> So + H2O + energy
b. Elemental sulfur in turn can be oxidized to sulfate:
So + 1 1/2 O2 + H2O ---> SO42- + 2 H+ + energy
c. Habitats/Requirements?
(i) Oxic or anoxic? Bacteria that oxide sulfur-containing materials occur in both oxic and anoxic environments. Those that live in oxic environments perform the reactions shown above. A different electron acceptor, such as nitrate, is utilized in anoxic environments since the "favorite" acceptor, oxygen, is unavailable.
(ii) pH? Note that the oxidation of sulfur in oxic habitats produces sulfuric acid (SO42- + 2 H+ = H2SO4). Organisms doing these reactions must be acidophiles that can tolerate the resultant acidic habitats.
(iii) Source of hydrogen sulfide?
Desulfuration of decaying organic material releases hydrogen sulfide;
Sulfate reducers can generate hydrogen sulfide;
Volcanic activity releases hydrogen sulfide. For example, chemolithotrophs near thermal vents in the deep sea harvest the energy from this source. Thus they form the foundation of whole communities in the deep sea where light cannot penetrate.
(iv) When is elemental sulfur (So) oxidized? Organisms will oxidize hydrogen sulfide (H2S) until it runs out and then begin utilizing elemental sulfur. This is logical, since more energy can be acquired from oxidizing hydrogen sulfide compared to elemental sulfur. As we have seen before, use of an alternate substrate requires the expression of genes not previously expressed.
d. Organisms:
(i) Beggiatoa - historically important because it was the first chemolithotroph identified.
(ii) Thiobacillus - an obligate acidophile, very tolerant of low pH; in addition to oxidizing hydrogen sulfide, this organism can extract iron from solid pyrite (FeS2) in a two-step process in which sulfur atoms are oxidized.
First, the organism catalyzes the oxidation of ferrous iron, generating ferric iron
Fe2++ 1/2 O2 + 2 H+ -----> Fe3++ H2O
Secondly, the ferric iron produced spontaneously reacts with pyrite
FeS2 + 14 Fe3+ + 8 H2O -----> 15 Fe2+ + 2 SO42- + 16 H+
Note: The reaction is self-supporting, since the ferrous iron produced in the second reaction can be fed back into the first reaction. Thus these chain reactions will continue until all of the pyrite is exhausted. These reactions also generate copious amounts of sulfuric acid (H2SO4) that acidify the waters near coal mines, where there is plenty of exposed pyrite (See the more extensive discussion of acid-mine drainage in the next lecture.).
(iii) The Thiovulum/Riftia symbiosis - Riftia is a tube worm, ~ 2 meters long, found near thermal vents in the deep sea. Riftia contains an organ called a trophosome that harbours Thiovolum and several other prokaryotic genera (~ 4 x 109 cells/gram). The worm contains a unique hemoglobin that binds the hydrogen sulfide generated by volcanic activity and delivers it to the bacterial symbiont. Bacterial oxidation of the hydrogen sulfide generates the energy that is required to fix carbon. The worm receives the fixed carbon from the bacteria.
C. Sulfate reduction
Dissimilative sulfate reduction involves using sulfate as a terminal electron acceptor during the energy-generating oxidation of various materials (Table 16.6). A specific example of sulfate reduction involves the oxidation of molecular hydrogen (H2) that occurs in several steps:
1. Sulfate, which is fairly stable, is activated by reaction with ATP, forming adenosine phosphosulfate (APS) (Figure 16.31):
SO42- + ATP -----> APS + PPi
2. A hydrogenase splits molecular hydrogen, and the electrons contained therein are used to reduce the sulfur atom of APS, releasing sulfite (SO32-).
APS + H2 -----> SO32- + AMP + H2O
This reaction involves an intermediate electron carrier, cytochrome c3, that is diagnostic for dissimilative sulfate reducers (Figure 16.32).
3. Using more electrons derived from molecular hydrogen, sulfite is reduced, producing hydrogen sulfide:
SO32- + 6 H++ 6 e- ------> H2S + H2O + 2 OH-
Two additional points:
a. Sulfite is toxic to most organisms, so it is reduced as soon as it is produced, i.e. organisms do not wait until sulfate is exhausted to begin utilizing sulfite. The hydrogen sulfide product is also toxic, but it is a gas that escapes into the atmosphere as it is generated.
b. The reaction generates hydroxide ions that elevate the pH and thus aid in de-acidification.
4. Habitats/Requirements?
a. Oxic or anoxic? The dissimilative sulfate reducers live in anoxic environments. Recall that organisms that utilize electron acceptors other than oxygen usually live in anoxic habitats.
b. Best sources of sulfate? Sulfate reducers occur in aquatic habitats, where sulfate is generally abundant. Some occur in the anoxic layers of soils where a lesser amount of sulfate resides.
c. Autotrophs vs. organotrophs? The dissimilative sulfate reducers are mostly organotrophs. Because of sulfate's low reduction potential, its reduction generates little energy. In other words, sulfate is a poor electron acceptor. Thus, it is not practical to fix carbon using sulfate reduction as an energy source. As a rule, dissimilative sulfate reducers require a carbon source, commonly acetate.
Note - Some organisms can use a variety of electron acceptors. They exhaust the preferred acceptor first and then switch to the next best acceptor, etc.
Rank of electron acceptors: O2 > NO3- > SO42-
d. Can the methanogens compete? Recall that acetoclastic methanogens consume molecular hydrogen and acetate, producing methane. Thus, a competition exists between the dissimilative sulfate reducers and those methanogens. In aquatic environments, where sulfate is abundant, the methanogens lose the competition. An additional advantage of the dissimilative sulfate reducers over the methanogens as a group is that the sulfate reducers have a greater affinity for molecular hydrogen.
e. Some examples of sulfate reducers and their habitats:
Note that the prefix "Desulfo" indicates a sulfate reducer.
(i) Desulfovibrio - found in water-logged soils.
(ii) Desulfotomaculum - cause of the "sulfide stinker", a type of spoilage of canned foods. This is indicated by swelling of the can as hydrogen sulfide gas is produced and an unpleasant odor on opening the can.
(iii) Desulfomonas - found in intestines.
(iv) Archaeglobus - a thermophilic Archea whose optimal growth temperature is 83oC.
The test will be on Tuesday.
Albert