Question

In ________, colour is added before the fiber is extruded.

• A. Stock dyeing
• B. Cross dyeing
• C. Solution pigmenting or Dope dyeing
• D. Garment dyeing

Hint:

The pigment is mixed into the liquid spinning solution, so the colour sits inside the filament.

Answer 1

The Correct Option is C

Step 1: Understand the question:
The question asks which dyeing method adds colour before the fibre is extruded.
Extrusion means pushing the spinning liquid through a spinneret to form filaments.
So the colour must be added while the fibre is still a liquid.

Step 2: Apply the method:
In solution pigmenting, also called dope dyeing, pigment is mixed into the spinning solution.
The solution is then extruded through the spinneret.
The colour sits inside the fibre. This gives very good colour fastness.
It is used for man-made fibres such as polyester, nylon and acetate.

Step 3: Why the other options are wrong:
Stock dyeing colours loose fibre after it is made.
Cross dyeing dyes a fabric made of different fibres in separate dye baths to get different colours.
Garment dyeing colours the finished stitched garment.

Final Answer:
Colour is added before extrusion in solution pigmenting or dope dyeing, option (C).