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Bed bug blue reaction

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  1. Igor___

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    Posted 7 months ago
    Mon Apr 17 2017 16:07:31
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    Sorry guy, need advice one more time about bed bug blue.

    Does this looks like postive results?
    Its bluisch but i dont think it looks like a bright cobolt blue as David discribed earlyer.

    Whats the verdict?

    http://forumbilder.se/G829Q/image

  2. Igor___

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    Posted 7 months ago
    Tue Apr 18 2017 0:48:25
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    The stains i tested:

    https://www.pixeltopic.com/image/wxaurtpsmaurez/

    They are right in the middle of a board thats behind the bed, about 1,5 feet from the floor and 1,5 feet from the seeling.

    This is how the test looks today:

    https://www.pixeltopic.com/image/cukartfdijyefq/

    The blueisch hue is gone, is it supposed to do that eaven if the test was positive?
    What do you guys think?

  3. bed-bugscouk

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    Posted 7 months ago
    Tue Apr 18 2017 10:12:14
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    Hi,

    Neither are positive. Both display a phenomena called chromatography where pigment can separate with a solvent.

    The basic science illustration of this is often taught using water, filter paper and a sweet to show the colours which actually make up black or dark colours.

    I will send through a more technical explanation to the manufacturers to see if this cant be better documented. It might be worth adding these example images to the FAQ section on blue and revising the text accordingly.

    Hope that helps.

    David Cain
    Bed Bugs Limited

    If you have found this information helpful please consider leaving feedback on social media via google+ or FaceBook or by like/loving the images.

    In accordance with the AUP and FTC (legal requirements) I openly disclose my vested interest in Passive Monitors as the inventor and patent holder. Since 2009 they have become an integral part in how we resolve bed bug infestations. I also have a professional relationship with PackTite in that they distribute my product under their own branding. I do not however receive any financial remuneration for any comments I make about products.
  4. Igor___

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    Posted 7 months ago
    Tue Apr 18 2017 10:59:44
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    Ok, the same phenomenom as my last post that you responded.
    Is it allso because of this phenomenom the blue colour disapeard/got eaven lighter over night?

    I allso tested it on some i was 100% sure was not bed bug traces and that circel dit not become blue at all.
    Can you recomend how i can be certainne a test is not postive? Darker blue color?
    Does the colour stay on the sheat eaven after the liquid has dried out?

    Many thanx David!

  5. bed-bugscouk

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    Posted 7 months ago
    Tue Apr 18 2017 11:25:09
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    Hi,

    The only way I can think of making this clearer is by developing some graphics that illustrate this as a plot of pigment density as a section through the test material.

    With chromatography dispersed pigments you will always get those "out lying" peaks with the main peak being the darker sample transfer.

    With a positive result the excess of reactive material may itself diffuse the central peak and "bleed out" but that "shoulder" to the initial peak will never separate out int he same way that the pigment front from chromatography does.

    If this is not clear enough let me know and I will work on the graphic but it will take me a few days to be able to do.

    David

  6. Igor___

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    Posted 7 months ago
    Tue Apr 18 2017 12:06:18
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    Thanx! I understand it better now.
    But the reason that the blue colour disapeard over night was because the liquid dried right?

    If you got the time i would really appreciate a graphic if you got the time to sort one out.
    Many thanx!

  7. bed-bugscouk

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    Posted 7 months ago
    Tue Apr 18 2017 12:16:30
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    Hi,

    I am not sure if it is an effect only present when the solution is wet or if the solution degrades the pigment enough that it is not visible when dried.

    The blue colour of BBB does bleach out itself even when positive but the cobalt blue is very vivid even though that vividness does not translate well in the example image. Its a lot easier for people to see when they have positive material to compare against. I have been known to carry confirming material to illustrate that point when needed.

    David


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