Stereophile---2 in a row without measurements

[mansr]

So the marker is doing something.

That is extremely doubtful. Most of the laser light is reflected back into the detector. Only a small amount is scattered, and hardly any of that will strike the edge of the disc. Out of this already minuscule amount of light, the fraction that would then go on to reach the photodetector if not absorbed by the green paint is smaller still. It's nothing compared to the contrast between high and low levels of directly reflected light from the disc.

 

[anmpr1]

Although I don't believe in the "sonic" benefit of the green markers, I did have one CD which mistracked at a certain point on my Phillips CD player. I applied the green marker and it didn't mistrack anymore. So the marker is doing something.

My experience with discs was not obvious. I had some that were pretty scratched up which played fine. Others that looked OK that had errors.

 

[Killingbeans]

So to resume:
What POSCA pen colour colour should I now choose in 2020 for my CD's

Vantablack

EDIT: Here's the 2020 solution: Audio Desk Systeme CD Improver

 

[MakeMineVinyl]

That is extremely doubtful.

It was kind of a yes / no, works / doesn't work type of thing. I guess if I could go back in time I could wash the green stuff off and try to play it again on that long-gone Philips player, but I was more interested in playing the music that in scientific method at that time.

 

[Harmonie]

Vantablack

EDIT: Here's the 2020 solution: Audio Desk Systeme CD Improver

For 899€ I have a much better improvement ...
Buy other CD's or another media ...
Really - sometimes I feel some companies very courageous to spend huge money & investments in product development aso and hope a huge ROI ...
But after all, maybe I'm wrong and there are even more people who buy such a tool.

 

[mansr]

It was kind of a yes / no, works / doesn't work type of thing. I guess if I could go back in time I could wash the green stuff off and try to play it again on that long-gone Philips player, but I was more interested in playing the music that in scientific method at that time.

It is far more likely that you removed a smudge from the disc while applying the green paint.

 

[MakeMineVinyl]

It is far more likely that you removed a smudge from the disc while applying the green paint.

or maybe I sneezed on the disc when I was putting the green paint on and the act of sneezing blew away the crud. That's the only scientific explanation. By the way I never touch the playing surfaces of my CDs.

 

[Harmonie]

I never touch the playing surfaces of my CDs.

They all say that .... UV light will tell the truth.

PS- Beware of Covid when you sneeze

 

[mansr]

They all say that .... UV light will tell the truth.

PS- Beware of Covid when you sneeze

CDs might be more at risk from corvid.

 

[MakeMineVinyl]

PS- Beware of Covid when you sneeze

This was back in the 1980s pre COVID / Post Disco.

 

[MakeMineVinyl]

They all say that .... UV light will tell the truth.

My UV light is currently unavailable because its up one of my body cavities to protect me from COVID.

 

[scott wurcer]

It was kind of a yes / no, works / doesn't work type of thing. I guess if I could go back in time I could wash the green stuff off and try to play it again on that long-gone Philips player, but I was more interested in playing the music that in scientific method at that time.

I wasn't aware the green pens claimed to fix skipping a pathological failure to track which could easily be corroborated and I recall nothing about this ever mentioned at the time. The conversations were all concerned with the error correction and interpolation something for a good argument.

I was one of those, "Did you ever try it?", "NO".

 

[MakeMineVinyl]

I wasn't aware the green pens claimed to fix skipping a pathological failure to track which could easily be corroborated and I recall nothing about this ever mentioned at the time. The conversations were all concerned with the error correction and interpolation something for a good argument.

I was one of those, "Did you ever try it?", "NO".

I don't think they ever claimed to repair a skipping CD. For what it's worth I believe the skip was near the outer edge of the CD. That player eventually stopped playing CDs all together so it could have been an edge case where the laser mechanism was iffy.

 

[mhardy6647]

Although I don't believe in the "sonic" benefit of the green markers, I did have one CD which mistracked at a certain point on my Phillips CD player. I applied the green marker and it didn't mistrack anymore. So the marker is doing something.

That's interesting -- hard to control for experimentally, though

 

[mhardy6647]

This thread just triggered a flashback -- CD degaussers.

https://www.gcaudio.com/tips-tricks/cd-dvd-demagnetization/

 

[MakeMineVinyl]

That's interesting -- hard to control for experimentally, though

Wasn't experimenting, just what happened. The CD had that familiar "tick" sound at the same part of the track on every play. Did the green marker stuff, not to cure that problem but because a friend brought one over and suggested I try it. IRRC, I didn't hear any sonic change but the skip was gone and stayed gone. I don't have the CD player anymore nor the CD. Some things just have to remain mysteries, like UFOs.

 

[mansr]

Wasn't experimenting, just what happened. The CD had that familiar "tick" sound at the same part of the track on every play. Did the green marker stuff, not to cure that problem but because a friend brought one over and suggested I try it. IRRC, I didn't hear any sonic change but the skip was gone and stayed gone. I don't have the CD player anymore nor the CD. Some things just have to remain mysteries, like UFOs.

The obvious explanation is that in handling the CD to apply the green paint, you inadvertently removed a speck of dirt that was causing the read error. Did you ever try simply cleaning the disc to fix that problem?

 

[Robin L]

The obvious explanation is that in handling the CD to apply the green paint, you inadvertently removed a speck of dirt that was causing the read error. Did you ever try simply cleaning the disc to fix that problem?

These do work [sometimes]:

Buffs some scratches out. I attempted to get the glitches out of:

a DVD audio with video that glitches up when attempting the DVD Audio layer because there's just too much going on. The buffing machine did no good. Turns out the regular DVD layer, with a Dolby Surround mix, plays just fine.

 

[Harmonie]

This thread just triggered a flashback -- CD degaussers.

https://www.gcaudio.com/tips-tricks/cd-dvd-demagnetization/

Ok, you may laugh at me, but I think I have one somewhere ...

 

[Harmonie]

Thanks for reminding me that I had a box with lots of old stuff somewhere ...