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    e inked paper are removed from the written lines using a thin hollow needle.
    2. The tiny pieces of paper are then placed into a test tube, and a solvent is added to dissolve the ink.
    3. A drop of the solvent containing the ink solute is
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    When a document analyst from the CSI TV shows scrutinizes a document found at a crime scene such as a ransom note written by kidnappers or their victims, they study not only the handwriting but also the ink in order to determine a paper’s authenticity. Inks that appear similar physically may differ chemically. This distinction helps a criminal scientist determine whether the same ink was used for each word on each page of a document and may even help determine whether a particular ink existed at the time the document supposedly was written.

    One nondestructive technique of ink comparison is called microspectrophotometry. This process allows the examiner to accurately ascertain whether the colors of two inks match by comparing their light transmission, absorption, and reflection characteristics.

    Another technique for comparing ink samples in thin-layer chromatography (TLC), which is delineated in four steps:

    1. Very tiny samples of the inked paper are removed from the written lines using a thin hollow needle.
    2. The tiny pieces of paper are then placed into a test tube, and a solvent is added to dissolve the ink.
    3. A drop of the solvent containing the ink solute is

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    uthenticity. Inks that appear similar physically may differ chemically. This distinction helps a criminal scientist determine whether the same ink was used for each word on each page of a document and may even help determine whether a particular ink existed at the time the document supposedly was written.

    One nondestructive technique of ink comparison is called microspectrophotometry. This process allows the examiner to accurately ascertain whether the colors of two inks match by comparing their light transmission, absorption, and reflection characteristics.

    Another technique for comparing ink samples in thin-layer chromatography (TLC), which is delineated in four steps:

    1. Very tiny samples of the inked paper are removed from the written lines using a thin hollow needle.
    2. The tiny pieces of paper are then placed into a test tube, and a solvent is added to dissolve the ink.
    3. A drop of the solvent containing the ink solute is

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    ink existed at the time the document supposedly was written.

    One nondestructive technique of ink comparison is called microspectrophotometry. This process allows the examiner to accurately ascertain whether the colors of two inks match by comparing their light transmission, absorption, and reflection characteristics.

    Another technique for comparing ink samples in thin-layer chromatography (TLC), which is delineated in four steps:

    1. Very tiny samples of the inked paper are removed from the written lines using a thin hollow needle.
    2. The tiny pieces of paper are then placed into a test tube, and a solvent is added to dissolve the ink.
    3. A drop of the solvent containing the ink solute is

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    tch by comparing their light transmission, absorption, and reflection characteristics.

    Another technique for comparing ink samples in thin-layer chromatography (TLC), which is delineated in four steps:

    1. Very tiny samples of the inked paper are removed from the written lines using a thin hollow needle.
    2. The tiny pieces of paper are then placed into a test tube, and a solvent is added to dissolve the ink.
    3. A drop of the solvent containing the ink solute is

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    e inked paper are removed from the written lines using a thin hollow needle.
    2. The tiny pieces of paper are then placed into a test tube, and a solvent is added to dissolve the ink.
    3. A drop of the solvent containing the ink solute is then placed on a paper strip along with a few drops of several known control inks.
    4. Finally, the strip is dried and subsequently dipped into another solvent that migrates up the paper strip, dragging the inks along with it.

    The distance that all the inks traveled along the strip are determined by the respective sizes of their molecules. The smaller the ink molecules the further up the strip it travels. This procedure separates the ink into bands. Whenever inks from two different pages of a document in question are tested and they yield different bands, it is safe to conclude that the writing on the two pages was done with two entirely different inks.

    A comprehensive ink reference database is located at the Ink Library, a part of the Questioned Document Branch of the U.S. Secret Service Forensic Services Division. Furthermore, the U.S. Treasury Department keeps a comprehensive database of the TLC patterns of commercial inks. More recently, many in

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