4. Ist die rote Farbe des Markierstifts (CD-R PEN) ein Farbstoff?
(Seite im Aufbau)
Farbstoffe sind farbige Stoff, der von einem anderen Stoff wie z. B. einem Kleider-Stoff oder einer Faser dauerhaft gebunden wird. Dies geschieht in der Regel aus einer Lösung.
Im vorigen Experiment a coloured solution was left (Fig. 2). In the following experiment you will answer the question: Is it permanently bonded by fabrics, does it contain a dye?
You have to cut a strip from a Multifiber6 (MF6) which contains 6 different fabrics. In addition you use a piece of white washed wool from a sheep and cotton thread and boil it in the solution.
x .n .m
Materials
White washed sheep wool, cotton thread, a stripe of multifiber 6 (Fig. 1), 5-mL injection bottle with the coloured solution from the previous experiment (Fig. 2), electric hot plate.

Experiment
1. Immerse the white samples (Fig. 1) into the ampoules with the coloured water (Fig. 2).
2. Boil them for 1 hour.
3. Wash the samples and boil them in clean water.
4. Remove the samples, dry and fix them on a surface (Fig. 3).
Observation(Fig. 3)
1. The cotton thread and the following substances on the strip of MF6 keep white: cotton and polyester.
2. The wool and the following substances on the strip of MF6 are permanently dyed: wool, triacetate, nylon, polyacryl.
Explanation
The coloured red substance from the CD-R PEN is a dye for wool,  triacetate, nylon- and polyacryl fibres as it was permanently bonded like in the Experiment 3.


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