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    #1

    UV light on 2 sets of boards-- Strange results

    I hit these two sets of boards with UV light. Notice how there is reaction to the outside strands on one set and a mixture of strands on another set.

    I know UV light is not the acid test....but any idea why this odd reaction?

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    #2
    The reaction comes from the inside material where the outside strands are less tight.
    Attached Files

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      #3
      I have found that some molds, fungi and mildew will glow a bit. maybe the loose weave areas let moisture in ,and at some point there was mildew?

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        #4
        It is likely that silk yarns, or celloid yarns, could be used in the manufacture of the cord.

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          #5
          Do they really "glow" like a modern white T shirt or do they "react" a bit actually ?
          That would make a big difference to date the construction period …
          Nick

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            #6
            I have the same situation , and I’m curious if they are fake ?
            Attached Files

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              #7
              The Third Reich was using material brightness as early as 1927

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                #8
                It looks like a very dull glow on all the boards and board in the pictures. Its not that electric white glow u get from repro cardboard or paper. Its not the acid test, you have to be happy with the construction of the shoulder boards. You will find items that have been washed in modern washing power, will glow slightly, like a camo parker. It will glow a little bit more in seams of the pockets. Hope this is of some help. Regards Paul.

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                  #9
                  Lay the items on a brand new tee shirt and compare with UV light a foot away. Modern whiteners glow brightly and these will probably not even be noticeable.

                  Bob Hritz
                  In the land of the blind, the one eyed man is king.

                  Duct tape can't fix stupid, but it can muffle the sound.

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                    #10
                    Do any of you realize that Germans were making synthetic material since WW1? If any of you are still unhappy with your reproductions, you can send them to me.

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                      #11
                      Originally posted by Bob Hritz View Post
                      Lay the items on a brand new tee shirt and compare with UV light a foot away. Modern whiteners glow brightly and these will probably not even be noticeable.

                      Bob Hritz

                      I just did the test
                      Thank you Bob
                      Attached Files

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                        #12
                        Originally posted by chahler View Post
                        I just did the test
                        Thank you Bob

                        Quite a difference!!

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                          #13
                          Some of the threads might contain Perlon - artificial silk. I believe it was used as early as 1942. They will glow and melt.

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                            #14
                            A lot of German materials glows. For example early threads of zelth , or tarn cotton. Also some thin white threads.

                            Bayer patent of the end of 1800 discoloured threads and glows.

                            On paper is a completely other matter. On cloth UV light is nice to see stains, sweat and shadows.

                            Of course glowing in a different manner than a modern white shirt

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                              #15
                              I have found that it is common for the core threads in various types of bullion embroidery and wire braid to fluoresce. I found very many WWII German items that glowed, including insignia direct from vets, and even mundane equipment accessories like bread bag straps.


                              I actually stopped black lighting my cloth items. I ceased to see the utility of it.

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