Kassler brown 100 (Unpublished)

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Kassler brown is a brown coal and consists of humus and humic acids with a proportion of bitumen and manganese. This is why it is also known as Kassler earth. Due to its composition, it is considered a mixture of pigment and dye and is a colorant of plant origin. (Pictures & text: http://de.wikipedia.org/wiki/Kasslerbraun)

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