Cleaning of woolen fibers with hydrochloric acid or sulphuric acid is called –

Correct option is D

Carbonizing is the process of cleaning woolen fibers using acid (typically sulfuric acid or hydrochloric acid) to remove any vegetable matter such as leaves, twigs, and seeds that may be mixed with the wool. The acid treatment dissolves these impurities and leaves the wool fibers clean.
Information Booster: Carbonizing is essential for wool processing to ensure that only the wool fibers remain, as impurities can affect the quality of the finished fabric. This process is part of the preparation phase in woolen fabric production, ensuring the fibers are suitable for spinning and weaving.
Additional Knowledge:
· Singeing (Option a) removes protruding fibers, but it does not specifically clean the wool as carbonizing does.
· Candling (Option b) is unrelated to fabric processing, as it is a method used in egg quality control.
· Calendaring (Option c) refers to a mechanical process used to smooth and finish fabric, not to clean it.