[TheForge] Re: Cheap Autodarkening Welding Helmet.

Tue Aug 12 12:47:00 2003

Excellent suggestion.

There are many minerals and some glasses that fluoresce.  Some yellow
marbles fluoresce nicely.  Rubies (industrial will do) fluoresce red -
so you have to be in a dark room to tell they're fluorescing. 
Fluorescent paints may work.

Quick and dirty UV tester.  Could be very useful.

Now, if you set up such a test, be sure to test plate (window) glass. 
You'll be amazed how effective a UV-absorber it is.

Bruce
NJ

>>> [email protected] 08/11/03 01:21AM >>>
>Date: Sun, 10 Aug 2003 22:19:59 -0400
>From: Steve Smith <[email protected]>

[snip]

>> A quick go/no-go test for UV absorption is to look at a UV light
source
>> through the lens/shield.  The light source souuld should appear
dark.
>
>I agree that the front clear plastic shield should stop the UV.
>You can't tell anything, however, about UV by looking--UV is not
visible
>to the human eye.

That's what I get for typing too fast...   If you shine the UV source
against an object that is fluorescent under UV, then put the plastic
shield
between the source and the object, and will no longer fluoresce.

Ken
:-)

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