| Topic: |
Science > Physics |
| User: |
"T. K. Edwards" |
| Date: |
10 Aug 2005 03:25:34 AM |
| Object: |
Re: Success with DVD Decrypter |
On Tue, 9 Aug 2005 00:55:02 -0700, Anon wrote:
Another good thing to use is eyeglass cleaner, it is made to clean plastic
eyeglasses and will not harm the DVD. Always wipe from the center to the
outside, never around the DVD.
Purists might also wish to radially wipe a damaged rental DVD with any waxy
substance of about the same reputed refractive index as the polycarbonate
plastic coating on the bottom of the DVD disc. Wipe that clean with a hard
cloth (not a soft cloth, which may leave lint particles behind).
Dunno what common matching refractive index substance is best but most
people swear by plain ole' toothpaste (the white variety). Personally, I'm
surprised as toothpaste generally contains sand particles, aka silicon
dioxide (admittedly tiny). Maybe the mild scouring softens the sharp edges
of the scratches, reducing errant deflection of laser light beams. Dunno.
I have friends with infants who use diaper cream (which seems to contain
some titanium or zirconium compounds in the creamy white gel). Others trust
in Turtle Wax or anti-fungal cream. I
'd guess they all purportedly work the same way (presumably by filling in
the polycarbonate scratches preventing diffuse refraction of the beam
outward away from the laser pickup).
A chemist or physicist on the group might be able to explain what would
work best and how it works - but it seems to work for me (maybe no better
than a placebo, but then, I'm not a chemist or physicist).
TKE
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| User: "Rod Speed" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 04:31:06 AM |
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T. K. Edwards <TKEdwardsAmI@hotmail.com> wrote
Anon wrote
Another good thing to use is eyeglass cleaner, it is made
to clean plastic eyeglasses and will not harm the DVD. Always
wipe from the center to the outside, never around the DVD.
Purists might also wish to radially wipe a damaged rental
DVD with any waxy substance of about the same reputed
refractive index as the polycarbonate plastic coating on the
bottom of the DVD disc. Wipe that clean with a hard cloth
(not a soft cloth, which may leave lint particles behind).
Its trivial to get the lint off and safer to use a soft
cloth so you dont end up scratching the surface.
Dunno what common matching refractive index substance is best
but most people swear by plain ole' toothpaste (the white variety).
That isnt used for matching refractive index, its used as a mild abrasive.
Personally, I'm surprised as toothpaste generally contains
sand particles, aka silicon dioxide (admittedly tiny).
That's why its used.
Maybe the mild scouring softens the sharp edges of the scratches,
Yep.
reducing errant deflection of laser light beams. Dunno.
Its more complicated than that.
I have friends with infants who use diaper cream (which seems
to contain some titanium or zirconium compounds in the creamy
white gel). Others trust in Turtle Wax or anti-fungal cream. I'd
guess they all purportedly work the same way (presumably by
filling in the polycarbonate scratches preventing diffuse refraction
of the beam outward away from the laser pickup).
Nope, they're all mild abrasives.
A chemist or physicist on the group might be able to explain what
would work best and how it works - but it seems to work for me (maybe
no better than a placebo, but then, I'm not a chemist or physicist).
That's obvious.
.
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| User: "" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 08:12:14 AM |
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I have friends with infants who use diaper cream (which seems
to contain some titanium or zirconium compounds in the creamy
white gel).
"Nope, they're all mild abrasives. "
I disagree. Its a compound that does not allow anything in or out,
thus protecting from scratchs and irritation, not creating it. I mean
that would be stupid putting an abbrasive rash cream on a babys rash
right?
Zinc Oxide = skin protectant. *==Also this was learned in advanced
Chem in highschool. You can use a different form of zinc to try and
scratch the surface, but this is not its purpose nor content==*
Also by the in-active ingrediants you will see that its a barrier,
protectant, not an abrasive. : Avena Sativa kernal flour (oats to those
that dont know), dimethicone (a smoothing paste), glycerin (activator),
iodopropynyl butylcarbomate, lactic acid, lanolin (small crack filler
and sealer, like scratches), magnesium sulfate (filler),
microcrystalline wax (do i really need to tell you what the wax is
for?), mineral oil (solvent), synthetic beeswax, and water.
As any parent knows, most all baby rashs are little open sores, and
putting an abrasive on that would be hurtful and negative. This
product is not an abrasive.
Please try and be a little nicer instead of short answered and
conceded.
regards
SilverSurfer
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| User: "Rod Speed" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 01:44:00 PM |
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wrote
I have friends with infants who use diaper cream
(which seems to contain some titanium or zirconium
compounds in the creamy white gel).
"Nope, they're all mild abrasives. "
I disagree.
Your problem.
Its a compound that does not allow anything in or out,
The last thing you want with a DVD.
thus protecting from scratchs and irritation, not creating it.
Toothpaste and diaper cream dont do anything like that.
I mean that would be stupid putting an
abbrasive rash cream on a babys rash right?
Zince oxide isnt that abrasive.
Zinc Oxide = skin protectant.
It only protects against UV with sunscreens,
and DVDs dont get skin cancer.
*==Also this was learned in advanced Chem in highschool.
You should have been failed. And some of us
did much more advanced chem than highschool.
You can use a different form of zinc to try and scratch
the surface, but this is not its purpose nor content==*
Mild abrasives arent used to scratch the surface, they are
used to abrade away the scratches that are the problem.
Also by the in-active ingrediants you will see
that its a barrier, protectant, not an abrasive.
Wrong again, most obviously with toothpaste.
: Avena Sativa kernal flour (oats to those that dont know),
dimethicone (a smoothing paste),
Thats the mild abrasive.
glycerin (activator), iodopropynyl butylcarbomate,
lactic acid, lanolin (small crack filler and sealer, like
scratches), magnesium sulfate (filler), microcrystalline
wax (do i really need to tell you what the wax is for?),
mineral oil (solvent), synthetic beeswax, and water.
As any parent knows, most all baby rashs are little open sores,
and putting an abrasive on that would be hurtful and negative.
Its MUCH more complicated than that.
And talcum powder is ALSO a mild abrasive
and is used on baby's bums anyway.
This product is not an abrasive.
Wrong again. And have fun explaining how toothpaste isnt.
Please try and be a little nicer instead
of short answered and conceded.
Go and ***** yourself. No please, that's an order.
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| User: "Louis Hom" |
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| Title: Re: Success with DVD Decrypter |
11 Aug 2005 08:40:45 AM |
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I am pleased to say that Rod Speed is not a regular on sci.chem, so don't
take his poor behavior as being representative of that group.
Having said that, the listed materials are all indeed abrasive toward the
DVD surface (if not toward a baby's bottom). i.e., he is correct.
As for nonabrading remedies, my friend has had good success on CDs with
Pledge furniture polish and that might work on DVDs too.
--
______________________________________________________________________________
Lou Hom >K'93
lhom@ocf.berkeley.edu
http://www.ocf.berkeley.edu/~lhom/
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| User: "" |
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| Title: Re: Success with DVD Decrypter |
11 Aug 2005 08:59:25 AM |
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"Louis Hom" <lhom@OCF.Berkeley.EDU> wrote in message
news:ddfkgt$1q1m$1@agate.berkeley.edu...
I am pleased to say that Rod Speed is not a regular on sci.chem, so don't
take his poor behavior as being representative of that group.
****** That is what killfiles are made for ;>)
As for nonabrading remedies, my friend has had good success on CDs with
Pledge furniture polish and that might work on DVDs too.
********Two suggestions, which I have not evaluated yet, are the popularly
advertised
formulation used to mask scratches on eyeglasses, and a polishing compound
for plastic
automobile lenses.
I have used the latter (Mothers or Macquires sp?) with good success.
Available at just about
any auto parts palace, it really makes deteriorated lenses clear.
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| User: "The Real Bev" |
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| Title: Re: Success with DVD Decrypter |
11 Aug 2005 02:04:42 PM |
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wrote:
"Louis Hom" <lhom@OCF.Berkeley.EDU> wrote:
As for nonabrading remedies, my friend has had good success on CDs with
Pledge furniture polish and that might work on DVDs too.
********Two suggestions, which I have not evaluated yet, are the popularly
advertised formulation used to mask scratches on eyeglasses,
The experts in sci.med.vision say this stuff is worthless, at least for
filling scratches on eyeglasses. Maybe it makes a nice dessert topping.
--
Cheers,
Bev
----------------------------------------------
Linux: The penguin is mightier than the sword
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| User: "" |
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| Title: Re: Success with DVD Decrypter |
11 Aug 2005 05:14:43 PM |
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"The Real Bev" <bashley@myrealbox.com> wrote in message
news:42FBA14A.2BBA37F@myrealbox.com...
The experts in sci.med.vision say this stuff is worthless, at least for
filling scratches on eyeglasses. Maybe it makes a nice dessert topping.
--
Cheers,
Bev
----------------------------------------------
Linux: The penguin is mightier than the sword
Thanks, luv
I dont doubt that it is worthless for the longer term. If it can coat a
disk and allow you to make a
clean copy, then it has some merit. Haven't tried it, dont know.
I will be glad when disks are gone and something more substantial replaces
them
med vennlig hilsen
L
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| User: "The Real Bev" |
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| Title: Re: Success with DVD Decrypter |
11 Aug 2005 06:35:27 PM |
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wrote:
"The Real Bev" <bashley@myrealbox.com> wrote:
The experts in sci.med.vision say this stuff is worthless, at least for
filling scratches on eyeglasses. Maybe it makes a nice dessert topping.
Thanks, luv
I dont doubt that it is worthless for the longer term. If it can coat a
disk and allow you to make a
clean copy, then it has some merit. Haven't tried it, dont know.
I will be glad when disks are gone and something more substantial replaces
them
Requiring us to once again rebuild our collections.
--
Cheers,
Bev
+++++++++++++++++++++++++++++++++++++++++++++++++
"It doesn't get any easier - you just go faster."
-- Greg Lemond
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| User: "" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 05:27:23 PM |
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Let's all keep the personal comments to ourselves, please.
So far the consensus seems to be that scratches are best repaired by
polishing with the very finest of abrasives. I remember once trying
that with Vim liquid, which I think contains alumina and is used on
bathtubs, refridgerators and other whitewear, but it was too abrasive
and left a white mark behind. Maybe I could have followed the Vim with
toothpaste polishing?
Is there nothing to the "fill in the scratch with a high refractive
index material" approach?
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| User: "Rod Speed" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 05:50:37 PM |
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wrote
Let's all keep the personal comments to ourselves, please.
Lets you keep your demands to yourself. No please, that's an order.
So far the consensus seems to be that scratches are best
repaired by polishing with the very finest of abrasives.
Or use the machine at the DVD rental operation.
I remember once trying that with Vim liquid, which I think contains
alumina and is used on bathtubs, refridgerators and other whitewear,
but it was too abrasive and left a white mark behind. Maybe I could
have followed the Vim with toothpaste polishing?
It'd have to be a pretty bad scratch to need Vim in the first place.
And I'd use the DVD machine in that situation anyway.
Is there nothing to the "fill in the scratch
with a high refractive index material" approach?
Yes, its certainly a valid approach, but it
isnt what toothpaste or diaper cream does.
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| User: "Bob Ward" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 06:37:03 PM |
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On 10 Aug 2005 15:27:23 -0700, wrote:
Let's all keep the personal comments to ourselves, please.
So far the consensus seems to be that scratches are best repaired by
polishing with the very finest of abrasives. I remember once trying
that with Vim liquid, which I think contains alumina and is used on
bathtubs, refridgerators and other whitewear, but it was too abrasive
and left a white mark behind. Maybe I could have followed the Vim with
toothpaste polishing?
Is there nothing to the "fill in the scratch with a high refractive
index material" approach?
I've had good results using the polish sold to clean and polish
convertible windows.
BlueMagic Plastic & Plexiglass cleaner and light scratch remover
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| User: "Ian Stirling" |
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| Title: Re: Success with DVD Decrypter |
10 Aug 2005 12:09:23 PM |
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In sci.physics wrote:
I have friends with infants who use diaper cream (which seems
to contain some titanium or zirconium compounds in the creamy
white gel).
"Nope, they're all mild abrasives. "
I disagree. Its a compound that does not allow anything in or out,
thus protecting from scratchs and irritation, not creating it. I mean
that would be stupid putting an abbrasive rash cream on a babys rash
right?
Err, no.
Skin is quite different from optical plastic.
Which is one of the reason they don't make CDs from babies.
Abrasives only cut, if they can dig in.
On a soft surface like skin, especially with a oily base, they simply don't,
and act to sooth the skin.
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