Question

Dyes which are directly attach to fibre without any
mordant is known as
Options
Acid dye
Direct dye
Disperse dye
O Mordant dye​

Answer 1

Answer:

Direct dye do not need any mordant

Answer 2

Answer:

Dyes that are directly attached to fiber without any mordant is known as (b)Direct Dye

Explanation:

Direct dyes are substantive for cotton and other cellulosic fibers.

• In this method, the fiber is directly immersed in the dye solution.

• Since salts like sodium sulfate are usually added during the dyeing. Hence, they are also known as salt colors

• Congo red and Mauritius yellow are typical examples of direct dyes.

Mordant dyes do not dye animal or vegetable fibers directly but require a mordant.

• For an acidic dye, a basic mordant is used, and vice versa.

• For acidic dyes, the mordants are metallic hydroxide whereas, for basic dyes, tannic acid is generally used.

• Alizarin is an example of a mordant dye.

Acid dyes are the sodium salts of sulphonic acid and nitrophenols.

• They dye animal fibers directly and are mostly applied to wool and silk.

• Orange-I, Orange-II, methyl red, etc. are examples of acid dyes.