There are three main coloring methods for fabrics: direct coloring, coloring through chemical reaction, and dispersion coloring. Direct coloring only dyes the surface of a fabric and does not bond strongly to fibers. Coloring through chemical reaction uses conditions like alkalinity and lack of oxygen to allow dyes like indigo to react and change color. Dispersion coloring involves heating fibers to open them and allow disperse dyes, the only dyes insoluble in water, to enter and dye polyester and acetate fibers from within.

1. Kalle, Samuel and Miro

2. • There are three known coloring methods. Direct coloring, coloring as a result of a
chemical reaction and dispersion coloring
• There are different coloring methods, because different materials need
different methods, chemicals and dyes for coloring
• Dyes also need different time to react with the fabric
• Temperature is also important factor when coloring fabrics

3. Direct coloring means placing
dyes directly to the fabric
For example
direct
printing
It dyes only the surface of
the fabric so it won't make
strong bond between the
fabrics or tissues fibers and it
leaves off easily on the fabric
For example
Printed logos
on t-shirts

4. • Congo red is an azo dye which means
it's synthetically made colouring for fabrics and
for other materials.
• The usage of congo red has decreased in
textiles due to the poor persistence of the color

5. Coloring as a result of a chemical reaction
• Uses chemical reactions to dye the color of
the textile
• For example indigo dyeing. Chemical reaction
is needed for making the right conditions for
the dyeing with indigo
• The dye must be alkaline and oxygenless
• At the end of dyeing, the color needs to react
with the oxygen to change to blue

6. • In dispersion coloring,
the fiber is heated when the fiber opens
and dispersion coloring goes in the fiber
• Dispersion coloring is mainly used for
coloring polyester fibers
• Disperse dyes are the only insoluble dyes
with water, that dye polyester and
acetate fibers
• They are non-ionic and organic