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  • Purpose

    Colorfastness test is a test to check whether the product bleed easily or not. Especially a product with arrangement of colors, printed product with wide area of white parts, striped pattern, etc. should be handled with care.

    bleeding.jpg

    What is bleeding?

    Bleeding is a phenomenon that occurs when dyestuff transfer from dyed part to white or light colored part by getting the clothes wet due to laundering or rain.

    How do colors transfer?

    There are 2 types of color transfer phenomenon which are staining and bleeding (bleeding and smudging).
    Staining means dye eluted with solvent transfer to different fabric (adjacent fabric) or colors other fabric due to rubbing.
    Bleeding is a staining phenomenon that occurs when the solvent transfers from wet part to dry part. It d by the free dye which transfers by capillary action between the fibers .

    Why do color transfer occur?

    Color transfer can be caused by many reasons. One of the reason that occure very often is "lack of soaping (laundering)". Dyestuffs are used when dyeing the textiles however, not all of the dye is fixed on the fiber. This dye which did not get fixed is called "unfixed dye" in general. This is described in the picture below, which the dyestuff is on top the fiber and not drawn within the fiber. When unfixed dye is not efficiently washed off in the soaping process (so-called lack of soaping or soaping failure) in which its process is after dyeing, there is a high possibility it can lead to trouble.

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    Test Method

    This is a test to check the bleeding of dye from dyed part to white or light color part, which is to be carried out on different and dark color combination printed fabric, fabric with arrangement of colors, and dyed part of fabric such as yarn dyed sripes. Our laboratory tests based on "Colorfastness Test Method (Daimaru Method)".

    1. As a preparation of the sample, use a thin strip for printed or striped fabric. In case of plain fabric, sew 2.5 cm x 3 cm of the sample on to 20 cm cotton adjacent fabric and use this as a test speciment.
    2. Wet the one side of the specimen for 2 cm using a beaker with 0.05% non-ionic surfactant solution.
    3. After leaving it standing for 2 hours, remove the beaker and dry naturally. Assess the white fabric or adjacent fabric of staining grade.

    How the Test is Carried Out

    bleed_test.pngbleed_test2.png

    Test Result

    Same as or darker than Greyscale for staining No. 4: Assessed as "Staining found." or Grade 4
    When lighter than Greyscale for staining No. 4: Assessed as "Slight staining" or Grade 4-5
    When no staining is found: Assessed as "No staining" or Grade 5

    greyscale.png

    *When staining occured due to processing agent other than dyestuff, it should be noted and should not be regarded as bleeding.

    Testing ServiceBleeding (2016-09-08)
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