Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Cross dyeing can produce multi-coloured plaids or striped fabrics.
Reason (R): Cross dyeing fabric made from different fiber types accepts a different type of dye and becomes a different colour.
In light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
• C. (A) is correct but (R) is not correct.
• D. (A) is not correct but (R) is correct.

Hint:

Cross-dyeing is a highly cost-effective industrial method for producing multi-colored patterns (plaids, stripes) from a single dye bath, utilizing the distinct dye affinities of blended fibers.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Cross dyeing is a specialized dyeing method used for blended fabrics (fabrics woven or knitted from two or more chemically distinct fiber types) to produce multi-color effects in a single dye bath.

Step 2: Detailed Explanation:
Let us analyze the statements:
1. Assertion (A) is Correct: By pre-arranging different yarns (e.g., cotton warp and polyester weft) into plaid or striped patterns on a loom, a multi-colored pattern can be produced during a single subsequent dye process (cross-dyeing).
2. Reason (R) is Correct: Since different fibers have different chemical structures, they require different classes of dyes (e.g., disperse dyes for polyester, reactive dyes for cotton). When placed in a mixed dye bath, each fiber selectively absorbs only its compatible dye class, coloring the polyester stripes one color and the cotton stripes another.
3. Since the selective chemical dye affinity explained in (R) is the direct reason why multi-colored patterns are achieved in (A), (R) is the correct explanation of (A).

Step 3: Final Answer
The correct option is (A).