[Jewelry making - Article 00131] - Re: [Orchid] Infrared light

[Mike Aurelius]

========[ Invite a Friend - http://www.ganoksin.com/invite.htm  ]========


    Donna - I find it very difficult to believe that this "gold-tone"
    filter is a true shade 5. ANSI Z87 calls out the specific
    requirements for welding shade numbers (there is a CE number, but
    off-hand, I'm not sure what it is), and it must meet very specific
    UV, IR, AND visible light transmission percentages in order to
    qualify for a marked shade number. If the "gold-tone" lens has better
    visibility than a standard shade 5, it most likely IS NOT a true
    shade 5 filter. The best way to find out is to contact the
    manufacturer of the lens and ask for the ANSI Z87 certification for
    this filter. 

    Manufacturers will sometimes mark lenses as being a specific shade
    number without doing the tests. I'm not sure why, but they do. Other
    manufacturers (like a company called Oberon) sell filters with names
    that lead the purchaser to believe that they contain a specific
    element when in fact it does not (Didymium II comes to mind - this
    product does not contain didymium). It is very much a case of 'Let
    the buyer beware' - be knowledgeable about what you want and what you
    are going to use it for. 

Mike Aurelius

____________________________________________________________________
T h e   O r c h i d   L i s t
Open Electronic Forum for Jewelry Manufacturing Methods and Procedures
____________________________________________________________________
Orchid FAQ:
~ http://www.ganoksin.com/orchid/faq.htm
Orchid Archives:
~ http://www.ganoksin.com/orchid/archive
Orchid Galleries:
~ http://www.ganoksin.com/orchid/gallery.htm
Invite a Friend:
~ http://www.ganoksin.com/invite.htm
____________________________________________________________________
Tips From The Jeweler's Bench - Article Archive
~ http://www.ganoksin.com/borisat/tip_sear.htm
The Jeweler's Selected Bibliography List
~ http://www.ganoksin.com/jewelry-books
Buy Orchid Jewelry:
~ http://www.ganoksin.com/shop
____________________________________________________________________
-Unsubscribe:
-Email: orchid-request AT ganoksin.com Body=unsubscribe subject=blank
____________________________________________________________________