<< <i>First: Rinse the coin in running water rinsing all sides including the edge. Second: Now swish the coin in the Distilled Water Third: Rinse in 91% Isopropyl alcohol
All the above requires plastic coin tongs. >>
OK, will try it tomorrow. I assume you mean 99.9% Isopropyl, correct? That's what I have available, optics grade. But that's not the end of the experiment. I need to get what's left on the coin onto the mirror for inspection. So, what I will do is let the last bit of excess Isopropyl drip onto the clean mirror for evaporation.
<< <i> Plus some of the chemicals in the dip are probably not water soluble anyway. >>
If the chemicals weren't soluble in water, they wouldn't be in the dip, now would they? >>
Not true. Are you absolutely sure that the dip contains ONLY water soluble components? After my experiment documented above, I am absolutely sure this is not the case. >>
If you have access to a turbidimeter you could tell if this is true or not.
<< <i>First: Rinse the coin in running water rinsing all sides including the edge. Second: Now swish the coin in the Distilled Water Third: Rinse in 91% Isopropyl alcohol
All the above requires plastic coin tongs. >>
OK, will try it tomorrow. I assume you mean 99.9% Isopropyl, correct? That's what I have available, optics grade. But that's not the end of the experiment. I need to get what's left on the coin onto the mirror for inspection. So, what I will do is let the last bit of excess Isopropyl drip onto the clean mirror for evaporation.
RayP >>
Went off and did as you proposed, but before you edited to add more steps...and here are the results. I let several drops fall on the mirror and they spread out very thin...
PM me for coin photography equipment, or visit my website:
What you purport to be residue left on the coin after dipping is most like the silver surface layer that is removed by the acid in the dip. This dissolves in the dip as silver sulfate. Dip a silver coin into some Ezest and let the excess dip drip from the coin into a clean glass like a clear shot glass. Next dilute this with a tad of yer distilled water. Next procure some plain table salt; not the iodized kind. Completely dissolve a smidgen of this plain salt in a small secant of yer distilled water and add it to the dip residue in the shot glass. I'd bet it turns a milky cloudy white indicating the formation of silver chloride and the presence of dissolved silver. >>
But wouldn't the silver sulfate be soluble in water, and then rinse away? Is this the composition of the milky precipitate at the bottom of the EZest container?
PM me for coin photography equipment, or visit my website:
What you purport to be residue left on the coin after dipping is most like the silver surface layer that is removed by the acid in the dip. This dissolves in the dip as silver sulfate. Dip a silver coin into some Ezest and let the excess dip drip from the coin into a clean glass like a clear shot glass. Next dilute this with a tad of yer distilled water. Next procure some plain table salt; not the iodized kind. Completely dissolve a smidgen of this plain salt in a small secant of yer distilled water and add it to the dip residue in the shot glass. I'd bet it turns a milky cloudy white indicating the formation of silver chloride and the presence of dissolved silver. >>
But wouldn't the silver sulfate be soluble in water, and then rinse away? Is this the composition of the milky precipitate at the bottom of the EZest container? >>
Is this milky precipitate present in new virgin Ezest or does it build up over time? What are the exact ingredients listed on the container or contained in Ezest? There may be components in it that are not listed on the label. The milky precipitate could arise in a number of ways. Firstly, silver sulfate builds up to the point that it exceeds its solubility in Ezest. Secondly, the thiourea reduces soluble silver ion to insoluble silver metal. I expect that thiourea could reduce silver ions on the surface of the coin too.
To answer the first question; yes the silver sulfate should be soluble in water and be rinsed from the coin.
<< <i>To answer the first question; yes the silver sulfate should be soluble in water and be rinsed from the coin. >>
Add to this ... since we can all visualize insoluble material in a "used" container of E-Zest, we know that something is not in solution. However, this something easily rinses away with water. Not because the something is water soluble, but because of the physical force of the water to move the something. Chemistry meets physics.
Lane
Numismatist Ordinaire See http://www.doubledimes.com for a free online reference for US twenty-cent pieces
Comments
<< <i>
<< <i>First: Rinse the coin in running water rinsing all sides including the edge.
Second: Now swish the coin in the Distilled Water
Third: Rinse in 91% Isopropyl alcohol
All the above requires plastic coin tongs. >>
OK, will try it tomorrow. I assume you mean 99.9% Isopropyl, correct? That's what I have available, optics grade. But that's not the end of the experiment. I need to get what's left on the coin onto the mirror for inspection. So, what I will do is let the last bit of excess Isopropyl drip onto the clean mirror for evaporation.
RayP >>
Regular 88% azeotropic IPA should be sufficient.
<< <i>
<< <i>
<< <i> Plus some of the chemicals in the dip are probably not water soluble anyway. >>
If the chemicals weren't soluble in water, they wouldn't be in the dip, now would they? >>
Not true. Are you absolutely sure that the dip contains ONLY water soluble components? After my experiment documented above, I am absolutely sure this is not the case. >>
If you have access to a turbidimeter you could tell if this is true or not.
<< <i>
<< <i>First: Rinse the coin in running water rinsing all sides including the edge.
Second: Now swish the coin in the Distilled Water
Third: Rinse in 91% Isopropyl alcohol
All the above requires plastic coin tongs. >>
OK, will try it tomorrow. I assume you mean 99.9% Isopropyl, correct? That's what I have available, optics grade. But that's not the end of the experiment. I need to get what's left on the coin onto the mirror for inspection. So, what I will do is let the last bit of excess Isopropyl drip onto the clean mirror for evaporation.
RayP >>
Went off and did as you proposed, but before you edited to add more steps...and here are the results. I let several drops fall on the mirror and they spread out very thin...
http://macrocoins.com
<< <i>Not so fast my friend.
What you purport to be residue left on the coin after dipping is most like the silver surface layer that is removed by the acid in the dip. This dissolves in the dip as silver sulfate. Dip a silver coin into some Ezest and let the excess dip drip from the coin into a clean glass like a clear shot glass. Next dilute this with a tad of yer distilled water. Next procure some plain table salt; not the iodized kind. Completely dissolve a smidgen of this plain salt in a small secant of yer distilled water and add it to the dip residue in the shot glass. I'd bet it turns a milky cloudy white indicating the formation of silver chloride and the presence of dissolved silver. >>
But wouldn't the silver sulfate be soluble in water, and then rinse away? Is this the composition of the milky precipitate at the bottom of the EZest container?
http://macrocoins.com
<< <i>
<< <i>Not so fast my friend.
What you purport to be residue left on the coin after dipping is most like the silver surface layer that is removed by the acid in the dip. This dissolves in the dip as silver sulfate. Dip a silver coin into some Ezest and let the excess dip drip from the coin into a clean glass like a clear shot glass. Next dilute this with a tad of yer distilled water. Next procure some plain table salt; not the iodized kind. Completely dissolve a smidgen of this plain salt in a small secant of yer distilled water and add it to the dip residue in the shot glass. I'd bet it turns a milky cloudy white indicating the formation of silver chloride and the presence of dissolved silver. >>
But wouldn't the silver sulfate be soluble in water, and then rinse away? Is this the composition of the milky precipitate at the bottom of the EZest container? >>
Is this milky precipitate present in new virgin Ezest or does it build up over time? What are the exact ingredients listed on the container or contained in Ezest? There may be components in it that are not listed on the label. The milky precipitate could arise in a number of ways. Firstly, silver sulfate builds up to the point that it exceeds its solubility in Ezest. Secondly, the thiourea reduces soluble silver ion to insoluble silver metal. I expect that thiourea could reduce silver ions on the surface of the coin too.
To answer the first question; yes the silver sulfate should be soluble in water and be rinsed from the coin.
<< <i>To answer the first question; yes the silver sulfate should be soluble in water and be rinsed from the coin. >>
Add to this ... since we can all visualize insoluble material in a "used" container of E-Zest, we know that something is not in solution. However, this something easily rinses away with water. Not because the something is water soluble, but because of the physical force of the water to move the something. Chemistry meets physics.
Lane
See http://www.doubledimes.com for a free online reference for US twenty-cent pieces