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Dyeing three colours from the same dye bath

Description

This experiment illustrates how dyeing involves specific chemical interactions between the dye and the molecular nature of the fibre.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
dyeing-three-colours-from...



Apparatus Chemicals

Eye protection

Beakers (400 cm3), 4

Large watch glasses or petri dishes, 4

Tongs or forceps

Scissors

Sample tubes, stoppered, 6

Bunsen burner

Tripod

Gauze

Heat resistant mat

String and paper clips, crocodile clips or clothes pegs (Note 1)

Samples of these fabrics in white (Note 2):

wool, silk, nylon, cotton, polyester, cellulose acetate (‘triacetate’), polyester/cotton mix.

Access to:

Top pan balance

Acid blue 40, 0.06 g

Disperse yellow 7, 0.04 g (IRRITANT)

Direct red 23, 0.04 g (IRRITANT)

Hydrochloric acid, 2 M (IRRITANT), small quantity

Refer to Health & Safety and Technical notes section below for additional information.

 


 


Dyes Silk Wool Nylon Cotton Acetate Polyester Polycotton
Mix olive-green olive-green olive-green red yellow yellow orange
Red pale orange-red pale orange-red pale orange-red red almost white pink pink
Blue blue blue blue very pale blue white white almost white
Yellow orange orange orange pale yellow bright yellow bright yellow bright yellow

 




 


This experiment illustrates how dyeing involves specific chemical interactions between the dye and the molecular nature of the fibre.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.