coated fiber peeling

• Alan Adler of Western Connecticut University found that the image color could be reduced with a diimide reagent, leaving colorless, undamaged linen fibers behind. This confirmed spectral data that indicated that the image color was a result of complex conjugated double bonds; however, it proved that image color was found only on the outer surfaces of colored image fibers.

  Until this time, it had been assumed that the image color was a result of chemical changes in the cellulose of the linen.  This is an extremely important observation.

  This fact was confirmed by the observation that the image color on some fibers had been stripped off of their surfaces by the adhesive of the sampling tapes. The photomicrograph shows the places where two fibers were pulled out of the adhesive leaving their colored coating behind. The coating is too thin to measure accurately with a standard microscope; however, it appears to be 200-600 nanometers thick.

    For an explanation, see Chemistry of the Images.

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