Posted by Roy L. Fuchs on 12/30/05 00:19

On Thu, 29 Dec 2005 20:38:20 GMT, spam@uce.gov (Bob) Gave us:

>On Thu, 29 Dec 2005 19:12:04 GMT, Roy L. Fuchs
><roylfuchs@urfargingicehole.org> wrote:
>
>> No SOLVENTS ON DISCS. It is an easy rule to follow, regardless of
>>your not previously informed experiences.
>
>What about the solvents in a marker pen?

They "dry" (evaporate) virtually instantly, but that is the reason
that the makers of Disc marking specific markers would give to use
their products..
>
>> Take a dead writable disc, and press on it with a ball point pen on
>>the top side. Hold it up to the light and see readily the impression
>>goes right through to the bit carrying polymer layer.
>
>OK, I did exactly as you said to do - I wrote on the top with a ball
>point. I pressed quite hard too.
>
>NOTHING HAPPENED!

All I can tell you is that I know how such discs are constructed, and
the polymer layer is just beneath the top side of the disc. I don't
like that method of manufacture, but I do know it to be the way the do
it.

>You must be using an inferior disc.

Hahhahaa... ridiculous. Tandy invented the process, they all
follow it. Scrape a BAD disc, and examine it. It barely takes any
depth at all to "damage" the write layer.

> Try your ball point on a good disc
>like a Fuji MIJ TY.

It isn't worth arguing about. I know how they are made. If there
is a maker that has a thicker "top coat" they are outside the norm.

>> You must review.
>
>I should point out that the discs I use are silver lacquer coated on
>top and that is likely what protects them underneath.

Silver lacquer? All the more reason NOT to use a solvent that
immediately dissolves lacquer, let alone plastic. Both lacquer
thinner and acetone will.

>I agree that it is safer not to use acetone on a DVD - I don't even
>use labels - but if you absolutely must remove permanent marker ink,
>it may be worth a try if your disc is well coated and you use the
>acetone very sparingly. But you do it at your own risk.
>
>It was not necessary for you to get hysterical and insulting just to
>make your point.


I don't think poking fun at you was insulting at all, much less
hysterically so. Sheesh, bro.

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