Cleaning Pound Coins
pentode
pound coins to make them good enough to spend?
I have about £50 in pound coins which are quite
brown and discoloured.
What is the best way of cleaning them?
Jim Sewell
"> What is the best way of cleaning them?
As we're talking current money, either use them for coin operated machinery
or use a barrelling machine if you have access to one !
The bank will change them for you though if you bag them in units of £20,
saving loads of effort !
Jim
Doris Schmitz
pentode wrote in message
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pentode
Doris Schmitz <arth...@bellsouth.net> wrote in message
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> Olive oil.
Thanks, Doris. But wouldn't Popeye mind? :-)
I'll try it and see!
slipstick
+++++++++++++++++++++++++++++++++++++++
"pentode" <pen...@ntlworld.com> wrote in message
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pentode
No good, it made not the slightest difference.
Ringpull
protection.
1. Dip in spirit vinegar + salt - (this makes dilute hydrochloric acid
solution)
2. Dip briefly in dilute caustic soda or ammonia solution
3. Dry and then burnish with a small brass brush
Does not work well with badly corroded £1 coins - if left in the acid
for too long
the loose definition and become pitted.
Works well on old brass 3d bits too but it's difficult to spend them.
ringpull
PS Olive oil just makes them slippy
pentode
I will give it a try.
I have some patio cleaner, that is 10% hydrochloric acid.
(I'll try that instead of the spirit vinegar + salt).
Ringpull <nob...@nowhere.com> wrote in message
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Gerry
coins ?...........G
"pentode" <pen...@ntlworld.com> wrote in message
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Dan Holdsworth
<nob...@nowhere.com>
>Only try this on spending money - NEVER on old coinage - and wear eye
>protection.
>
>1. Dip in spirit vinegar + salt - (this makes dilute hydrochloric acid
>solution)
Actually, it doesn't.
What it gives is salt solution and dilute acetic acid.
>2. Dip briefly in dilute caustic soda or ammonia solution
>3. Dry and then burnish with a small brass brush
Odds are you're just wetting them, then knocking the muck off with the
brush anyway.
--
Dan Holdsworth PhD da...@supanet.com
By caffeine alone I set my mind in motion, By the beans of Java
do thoughts acquire speed, hands acquire shaking, the shaking
becomes a warning, By caffeine alone do I set my mind in motion
Ringpull
The salt dissociates into H+ and Cl- and the acetic acid to H+ and
CH3COO- ions. It's an equilibrium reaction which forms dilute Hydro-
chloric Acid and Sodium Acetate - more salt pushes the reaction towards
making more HCl. Obviously there is still a lot of salt and vinegar in
there too.
This is why it is more effective than using just plain vinegar - think
about it next time you have a bag of chips.
ringpull
Ringpull
The salt dissociates into H+ and Cl- and the acetic acid to H+ and
CH3COO- ions. It's an equilibrium reaction which forms dilute Hydro-
chloric Acid and Sodium Acetate - more salt pushes the reaction towards
making more HCl. Obviously there is still a lot of salt and vinegar in
there too.
This is why it is more effective than using just plain vinegar - think
about it next time you have a bag of chips.
ringpull
pentode
on my discoloured pound coins.
After I soaked them for about 5 minutes, it brought
them up a treat, all I needed to do was
wash them and polish with Jif liquid afterwards.
Now they look almost like new!
pentode <pen...@ntlworld.com> wrote in message
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Dan Holdsworth
>Sorry Dan, but you're wrong.
>
>The salt dissociates into H+ and Cl- and the acetic acid to H+ and
>CH3COO- ions. It's an equilibrium reaction which forms dilute Hydro-
'Fraid not.
You see, common salt is NaCl. Sodium Chloride.
Dissolve sodium chloride in water, and you get Na+ and Cl- ions in
aquaous solution; not H+ ions. By the way, I'd advise finding a new
supplier if that's the formula for the vinegar you're putting on your
chips; CH3COO is formic acid, not acetic acid; not a mistake you'd make
twice, I think.
>chloric Acid and Sodium Acetate - more salt pushes the reaction towards
>making more HCl. Obviously there is still a lot of salt and vinegar in
>there too.
Still wrong.
Weak acids partially dissociate in aqueous solution. Add a lot of neutral ions,
and you force them to associate a bit more. Saturate the solution with salt,
and the weak acid stays fully associated, and you get very little free H+.
Odds are all you're doing is setting up effectively a weak battery cell with
this set-up; the acid/saline acts as electrolyte, and the coin as
anode/cathode. That would account for the effects seen, anyway, regardless
of clueless pseudo-chemistry.
>This is why it is more effective than using just plain vinegar - think
>about it next time you have a bag of chips.
Oh I shall. I'll also think about trying a strong acid like phosphoric
acid [1] to do the same job; that might work even better.
[1] Sold in automotive shops to remove rust. Remember to wear gloves with
this stuff; it is very corrosive and human skin is no barrier to it.
Ringpull
(Ding, ding) Round 3....
Dan Holdsworth wrote:
>
> >The salt dissociates into H+ and Cl- and the acetic acid to H+ and
> >CH3COO- ions. It's an equilibrium reaction which forms dilute Hydro-
> 'Fraid not.
>
> You see, common salt is NaCl. Sodium Chloride.
Agreed - my mistake, I meant Na
> By the way, I'd advise finding a new
> supplier if that's the formula for the vinegar you're putting on your
> chips; CH3COO is formic acid, not acetic acid; not a mistake you'd
> make twice, I think.
Talking of making mistakes, here you are dead wrong - HCOOH is formic
acid and
CH3COO- *is* acetate. check any elementary chemistry book or search the
web.
(and if your PhD is in chemistry, give it back)
> Still wrong.
>
> Weak acids partially dissociate in aqueous solution. Add a lot of neutral ions,
> and you force them to associate a bit more. Saturate the solution with salt,
> and the weak acid stays fully associated, and you get very little free H+.
"Neutral ion" is an oxymoron - an ion cannot, by definition, be neutral.
I would like to know what causes the effect but contend that the
equilibrium reaction is...
NaCl + CH3COOH <--> HCl + CH3COONa
...until someone presents a convincing alternative.
Since the the solution contains Na+, Cl-, H+ and CH3C00- (you agree?)
then it
must contain the sub-set H+, Cl- which in what you find floating about
in an aqueous solution of hydrochloric acid.
> Odds are all you're doing is setting up effectively a weak battery cell with
> this set-up; the acid/saline acts as electrolyte, and the coin as
> anode/cathode. That would account for the effects seen, anyway, regardless
> of clueless pseudo-chemistry.
Now that is a clueless pseudo-explanation - a battery cell requires two
electrodes - try starting a car with just one terminal connected.
A coin has too low an internal resistance for this to be credible, try
again.
> >This is why it is more effective than using just plain vinegar - think
> >about it next time you have a bag of chips.
>
> Oh I shall. I'll also think about trying a strong acid like phosphoric
> acid [1] to do the same job; that might work even better.
You put phosphoric acid on your chips? That explains a lot :-)
> [1] Sold in automotive shops to remove rust. Remember to wear gloves with
> this stuff; it is very corrosive and human skin is no barrier to it.
Which is why it is also used as a flavouring in cola drinks?
...over to you Dan.
ringpull
Celeborn
>
>"Neutral ion" is an oxymoron - an ion cannot, by definition, be neutral.
>I would like to know what causes the effect but contend that the
>equilibrium reaction is...
>
> NaCl + CH3COOH <--> HCl + CH3COONa
>
>...until someone presents a convincing alternative.
>Since the the solution contains Na+, Cl-, H+ and CH3C00- (you agree?)
>then it
>must contain the sub-set H+, Cl- which in what you find floating about
>in an aqueous solution of hydrochloric acid.
Have to agree with the above, naturally there will be a degree of
dissociation of ions on both sides of the reaction as there must be an
aqueous solution present (in the acid).
Daniel - BSc (Hons), MSc ;)
--
<{---Celeborn---}>
>Welcome to the English Police State, leave your freedom outside.
"Nuclear war can ruin your whole compile." -- Karl Lehenbauer
T
available - it is called "Sif" due to the continentals not having "J" in
there alphabets......... Only jokin' mate - carrying on the thread.
Cheers,
Nige
Bsc, Ma, Phd, LCGI, HND, Toss. Er
PS- stick 'em in a barrel - cleans 'em up a treat.news:KRL98.38511$H37.4...@news2-win.server.ntlworld.com...
pentode
Mind you, we still have some "Vim" under our sink, it must be
well over 10 years old and is still unopened!
Now that stuff is good - it will cure coughs, colds,
scabby arseholes and pimples on the rhino pipe!
But it's a bit too rough for cleaning coins!
Cheers Nige.
P.N.Tode, V.D.& Scar, GWR, LMS, Aitchison Topeka & Santa Fe (Hons).
T <ni...@malone11.freeserve.co.uk> wrote in message
news:a6drcc$4u7$1...@news8.svr.pol.co.uk...
Gerry
.........HH.......G
stick
>
> Why bother cleaning them ? Bung them in the car park meter !
> .........HH.......G
or vending machines.........
Ringpull
ringpull
GCSE Woodwork (Hons), MOT, TV Lic. 50m Swim Cert. CAMRA
,
check!
Cheers,
Nigenews:3C8B5B33...@nowhere.com...
