Date : Thu, 08 Dec 2011 02:46:39 +0100
From : rick@... (Rick Murray)
Subject: Beeb_Cleaner_?
Hi,
Firstly, isn't h-peroxide the stuff girls use when they want to see if
blondes really do have more fun?
Secondly, while it may be possible to reverse some of the chemical aging
effects in the plastic, aging itself can't be undone. Not in Beebs, nor in
people.
Thirdly, so long as it isn't manky, what is wrong with being "aged"? Do you
really expect quarter-century old tech to be pristine? Have you ever seen a
steampunk movie that didn't have a palette leaning heavily towards sepia?
[examples: A series of unfortunate events, Sucker punch, or probably
anything else with Emily Browning]
Fourthly, guys with grey hair are supposed to be wise (I guess, therefore, I
would be an exception). Why shouldn't a computer be different? It has stood
the test of time, etc etc.
I guess, in a way, this goes back to a discussion re. JK's Tube chip and the
use of new parts in old machines - is it "authentic" to use new bits?
Here is one to ponder - you could replace the BASIC ROM in the Beeb you love
and grew up with, and it would still be the Beeb you love and grew up with.
Then you could replace the MOS - authentic parts, of course. Then the VIA.
And so on, piece by piece replacing everything. And there, still, would be
your cherished Beeb. And on the desk, a pile of bits that would assemble to
be... your beloved computer... Hang on, what?
Paradox. Contemplate.
Best wishes,
Rick
(sent from my mobile)
-----Original message-----
From: Rob <robert@...>
To: Tim Fardell <tim.fardell@...>
Cc: "bbc-micro@..." <bbc-micro@...>
Sent: 2011 Dec, Wed, 7 23:53:51 CET
Subject: Re: [BBC-Micro] Beeb Cleaner?
On 7 December 2011 22:26, Tim Fardell <tim.fardell@...> wrote:
> I'm not saying it doesn't work, but I think it's probably just
> whitening the plastic, as opposed to reversing the yellowing process.
> It'll look better, but you're not necessarily going to end up back at
> the original colour.
When this procedure was first mentioned, I spent a lot of time reading
back through the threads and posts where it was developed. The
browning is caused by bromine, and which was originally added to ABS
as a fire retardant, rising through the plastic to the surface and
reacting with Oxygen in the air to go brown.. The UV breaks this down
again, and the Hydrogen peroxide/TAED (Oxi) mix supplies a replacement
Hydrogen atom, which doesn't give the brown colour.
http://retr0bright.wikispaces.com/Ultra+Violet+Energy
Of course, I imagine that you can also see some bleaching effect from
the hydrogen peroxide itself, if it's strong enough or left on too
long..
Rob
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