Wash, Cut, Polish & Demagnetize

As I sat and read through the most recent threads on the "Agon" forum, I noticed a thread regarding "Glossary of Audio Myths". I noticed several comments regarding "greening" and demagnetizing CDs.

Without delving too deeply into the effects of laser light diffraction, deflection, dispersion and reflecting light from adjacent tracks creating "jitter", and to avoid reduntantly examining the fact that the aluminum "wafer" in a CD is not always just aluminum, but in many cases aluminum "alloy", I would like to attempt to dispel a few of these "myths".

Many CD manufacturing facilities use a coating of mold release agents on the manufacturing machinery and on the plastic substrate material in the actual CD to facilitate ease of handling throughout the manufacturing process. Somewhat similar to spraying a cooking pan with "PAM" to reduce sticking. The residual amounts remaining on the CD upon completion of manufacturing should be removed as it will cause minor deflection and loss of focus of the laser beam. Specialty chemicals are available specifically for this purpose. I wash the CDs thoroughly using Dawn dishwashing liquid and very warm water. I cannot confirm that this process is as effective as using the specialty chemicals, but it leaves the CD surface extremely clean and seemingly free from any "oily" feel.

I then cut the edge of the CD using an Audiodesk CD cutter. This process reduces the amount of laser scatter from exiting through the outer edge of the CD and flooding the inside of the CD transport with reflected laser light. By cutting a bevel on the edge of the CD, you actually reduce the edge surface area by which the diffracted laser light can disperse. Some may feel that this a bit excessive, but we must keep in mind that the results of these treatments are cumulative.

The next process involves applying CD "Green" to the beveled edge. The properties of the color value of the Green used in the majority of these coatings tend to absorb any stray laser light. I still, to this day, have not been able to figure out why Green is the color of choice although, I have been told that it is simply the values of each of these colors (Red laser light and Green) that work together in unison to "neutralize" the light. The initial washing of the CD also helps to enhance the adhesion of the green coatings.

Upon allowing the CD green to dry, I then apply CD diamond using 100% cotton balls, and polish using again, cotton balls. CD diamond is an optical enhancer similar to Optrix,
Vivid, etc. and also contains a anti-static component. Most of these "optical enhancers" work by simply filling in microscopic pores in the CD surface permitting a more direct transmission of the laser beam through the plastic substrate material to the actual CD surface.

The last step involves demagnetizing the CD using a Furutech RD-2 CD demagnetizer. CDs, contrary to what most people believe can and will become magnetized. The results are a less black background, a general "haze" and loss of detail. If Cds were made using pure aluminum with NO trace elements, this step might not be required.

The results of all this? Pretty damn amazing. Again, recognizing that the results of all of these steps are cumulative, when all is said and done, the improvement is quite significant. Although these steps may sound somewhat time consuming, each CD actually only takes about three minutes to complete.

I hope I have provided some insight as to "dispelling" some of these myths. I can, and will, stand by this process as time and time again these enhancements have made CDs a lot more listenable. And, I have dropped the jaws of many non-believers after they have heard the actual results.

Any comments regarding this process are welcome. Happy listening.

You're a funny guy Chichiuno. Have you ever considered a "stand-up" act?

For some reason, I envision you having spent a lot of time in the principal's office when you were attending school. You did attend school, didn't you?

Either that or countless hours spent in the "little boys room" reading Stereophile (and other) magazines.

See how it all catches up?
I will pass along another tip, I listen to mainly non audiophile type Cds many of which can have avearge/below average sound with bright hard grainy treble and thin mid range etc.

You can apply a 2nd treatment of Auric Illuminator polish gel to worst case Cds and it will refine treble even better than 1 treatment.......if you own below average recordings of these try this out.

(For example early U2 or Cocteau Twins Cds)

Sean, May I?
Cdc, in response to your questions, in order:

:The Audiodesk preferred bevel angle is 38 degrees plus or minus 30 minutes (1/2 degree).

:There is no corner radius. Edge thickness (at the outermost portion of the CD after beveling should be approx. .025".

:Yes, it is the outside diameter only that gets cut.

:You could in fact purchase a bench lathe to perform the same operation. But you could also purchase a $300,000 Mikro Seiki CNC machining center and create a CNC command string to go along with it.
If you were to use a bench lathe you would need to fabricate a fixture to maintain flatness of the CD while the machining operation was being performed. If the CD were to deflect under the pressure of the contact of the cutting tool, The recommended 38 degree cutting angle would not be maintained.

:See my preceeding post for the CORRECT Furutech website. Sorry.

:In regards to "ferrous impurities", that is not the only contributing factor to magnetism. The Furutech site will explain further.

: I have no familiarity with "optical oils" being used in conjunction with application to the CD surface. I stress REMOVING any releases, oils or other impurities from the CD surface.

:I assume when you say you tried Novus #1, you were applying it to clean the CD's surface. Novus #2&3 are scratch removers as Novus#1 is merely a plastic polish used for plastic and or polycarbonate surfaces.
The manufacturers of most of the optical enhancers will explain that their products are "filling in" microscopic imperfections in the CD's plastic surface, enhancing light transmission of the laser reader.

Cdc, I hope this provides the clarification you requested. And Sean, I didn't mean to "butt in", but I did want to respond to Cdc's questions addressed to me, and I figured I would kill several birds with one stone.