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'[OT]: Black Liquid'
2002\07\16@174912 by Jinx

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> > Hello everyone. Ok, I'm wondering if anyone knows of a liquid the
> > darkens color dramatically when it receives electric current. I have

Philips (I believe) have this integrated into their lighting systems
to control window darkness. And there is a type of visor for arc
welders that automatically darkens when you start making UV. It's
arranged like a microscopic venetian blind. You might find out a
few details searching for those

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2002\07\16@175921 by Pic Dude

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face
Good thought on the welding helmet.  These things switch
super-fast!  However, though I haven't experimeted with
one, I've heard that they are black when un-energized,
and clear otherwise.  This way, if the battery fails,
you don't toast your retinae/retinas.  But I find this
arrangement odd as well, for battery consumption reasons.

Cheers,
-Neil.


{Original Message removed}

2002\07\16@200141 by M. Adam Davis

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I've seen one that uses a solar cell.  I suppose the cell provides
enough current from the welding light to turn it black, no need to worry
about worn batteries.

-Adam

Pic Dude wrote:

{Quote hidden}

>{Original Message removed}

2002\07\16@212518 by Patrick J

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Actually you do need to 'worry' about worn batteries.
One of our helmet's batt. died and after that it wouldn't
switch to dark-black. And the responsetime was slow.
Even if it seems to use solar-energy it have a small
3.3v batt. inside soldered on the PCB.

Btw, if u're gonna try to fix one of those helmets...
I can tell you that they are really sensitive :-/


{Original Message removed}

2002\07\16@231138 by A.J. Tufgar

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Yeah these helmets were a neat idea.  Unfortunately the switching isn't
fast enough.  I was told that extended use of one of these helmets could
cause permanent vision damage as the brief flash of high intensity light
damages the retnia, even if it's only for a few mircoseconds.

I think it's because your pupils can't contract in this time either so
very high intesity light is recieved by the retina.

Aaron

> Good thought on the welding helmet.  These things switch
> super-fast!  However, though I haven't experimeted with
> one, I've heard that they are black when un-energized,
> and clear otherwise.  This way, if the battery fails,
> you don't toast your retinae/retinas.  But I find this
> arrangement odd as well, for battery consumption reasons.

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2002\07\17@022236 by Russell McMahon

face
flavicon
face
> Yeah these helmets were a neat idea.  Unfortunately the switching isn't
> fast enough.  I was told that extended use of one of these helmets could
> cause permanent vision damage as the brief flash of high intensity light
> damages the retnia, even if it's only for a few mircoseconds.
>
> I think it's because your pupils can't contract in this time either so
> very high intesity light is recieved by the retina.

These people claim to have overcome this it seems

       http://www.jackprod.com/literature/docs/20-01NXG.pdf

Claim "fastest in world" and UV protection at all times (filters).
Maybe.


       RM

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2002\07\18@135741 by Peter L. Peres

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On Tue, 16 Jul 2002, Pic Dude wrote:

>Good thought on the welding helmet.  These things switch
>super-fast!  However, though I haven't experimeted with
>one, I've heard that they are black when un-energized,
>and clear otherwise.  This way, if the battery fails,
>you don't toast your retinae/retinas.  But I find this
>arrangement odd as well, for battery consumption reasons.

The battery consumption is very low.

Peter

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2002\07\18@135753 by Peter L. Peres

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On Tue, 16 Jul 2002, M. Adam Davis wrote:

>I've seen one that uses a solar cell.  I suppose the cell provides
>enough current from the welding light to turn it black, no need to worry
>about worn batteries.

No, there are 6 button cells inside. That's what does them in. After 5
years they leak ... the photocell is the sensor.

Peter

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2002\07\18@135756 by Peter L. Peres

picon face
On Wed, 17 Jul 2002, Jinx wrote:

>> > Hello everyone. Ok, I'm wondering if anyone knows of a liquid the
>> > darkens color dramatically when it receives electric current. I have
>
>Philips (I believe) have this integrated into their lighting systems
>to control window darkness. And there is a type of visor for arc
>welders that automatically darkens when you start making UV. It's
>arranged like a microscopic venetian blind. You might find out a
>few details searching for those

What venetian blind ? I saw those made as LCDs.

Peter

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