This may seem obvious, but I don't think anyone mentioned it.
Wouldn't one way to differentiate between groove wear and a defect
caused by some moisture-related phenomena be to look at the lead-in
groove in comparison to the rest of the affected portion of the disc?
That is to say, if the disc has groove wear caused by a worn/chipped
stylus, the "haze" will be less prominent in the lead-in because the
grooves are further apart, whereas a haze caused by moisture/mold
would be more clearly visible in the lead-in groove area. No?
On Thu, Dec 3, 2009 at 3:09 PM, Roger Kulp <[log in to unmask]> wrote:
> No damage from a worn stylus is very different.If this were a message board,I could post photos of both.
> --- On Tue, 12/1/09, Steven C. Barr <[log in to unmask]> wrote:
> From: Steven C. Barr <[log in to unmask]>
> Subject: Re: [ARSCLIST] Pressing Haze: Help Needed
> To: [log in to unmask]
> Date: Tuesday, December 1, 2009, 5:58 PM
> ----- Original Message ----- From: "Aaron Levinson" <[log in to unmask]>
>> You are suggesting that one pass with a very worn stylus produced this kind of greying? That seems kind of hard to fathom considering all
>> the other anecdotal evidence that suggests that Mercury and Emarcy seem to exhibit this "record cancer" when almost no other labels do?
>> I have seen many records that have been played by a worn stylus and are greying but none that I have ever seen, stop so abruptly as this record does.
> Very possible! I once inadvertantly did the same thing to a LP disc I owned;
> I had bought and installed a new LP needle, which turned out to be either
> very damaged or mis-manufactured! I installed the new needle, then started
> playing an LP disc...and noticed the disc was being "greyed" as it was played!
> I took the needle back to the store, where they looked at it with their microscope
> and told me to STOP USING IT! The disc thereafter played with much noise
> audible in the greyed segment...fortunately, the album was still available, so I
> bought a replacement. I could identify the damaged copy through the fact that
> the first, and part of the second, cut was visibly "greyed!"
> Steven C. Barr
Timothy Wisniewski, M.L.I.S.
Visual Materials Archivist
Alan Mason Chesney Medical Archives
Johns Hopkins Medical Institutions
5801 Smith Avenue, Suite 235
Baltimore, MD 21209