DYES

Question 1

Dyed flax fibers have been found in the Republic of Georgia dated back in a prehistoric cave to ___ BP

Answer 1

36,000

Question 2

discovered MAUVE

Answer 2

William Henry Perkin, 1856

Question 3

first synthetic dye. discovered while attempting to produce quinine, in search of a treatment for malaria.

Answer 3

MAUVE

Question 4

A ___ is a colored compound, normally used in solution, which is capable of being fixed to a fabric.

Answer 4

DYE

Question 5

___ is responsible for dye color due to their unsaturation.

Answer 5

Chromophore group

Question 6

___ is responsible for dye fiber reaction.

Answer 6

Auxochrome group

Question 7

2 dye groups

Answer 7

Chromophore and Auxochrome group

Question 8

major source of dyes before

Answer 8

The roots, berries, bark, leaves, and wood of plants

Question 9

a colored compound, normally used in
solution, which is capable of being fixed to a
fabric. The dye must be ‘fast’ or chemically stable
so that the color will not wash with soap and
water, fade on exposure to sunlight etc

Answer 9

dye

Question 10

is normally done in a special solution
containing dyes and particular chemical
material

Answer 10

dyeing

Question 11

Most dyes are ___

Answer 11

organic compounds

Question 12

pigments may be ___

Answer 12

inorganic compounds

Question 13

generally give brighter colors and
maybe dyes that are insoluble in the medium
employed

Answer 13

pigments

Question 14

examples of auxochromes

Answer 14

examples of which are carboxylic
acid, sulfonic acid, amino, and hydroxyl
groups

Question 15

CLASSIFICATIONS OF DYES
A. Based on the Source

Answer 15

1. Natural: Vegetable origin, Animal origin, Mineral origin
2. Synthetic

Question 16

CLASSIFICATIONS OF DYES
B. Based on Ionic Nature

Answer 16

1. Anionic dyes: Reactive dye, Acid Dye.
2. Cationic Dyes: Basic Dyes
3. Non-ionic Dyes: Disperse dye

Question 17

CLASSIFICATIONS OF DYES
C. Based on Chromophoric Groups

Answer 17

1. Azo Dyes. 3. Nitro and nitroso dyes
2. Anthraquinone dyes. 4.triarylmethane dyes
3. Indigo dyes

Question 18

CLASSIFICATIONS OF DYES
D. Based on Chemical Structure

Answer 18

1. Ready-made dyes
   .
   *Water-soluble dyes: Reactive dye, dire ct dye, acid dye
   *Water insoluble dyes: Vat dye, Sulfur dyes
2. Ingrain Dyes
   *Mineral colors
   *Azoic colors
   *Oxidation colors

Question 19

are simply dye substances extracted from natural sources.

Answer 19

1. Natural Dyes

Question 20

quickly replaced the traditional natural dyes. They cost less, they offered a vast range of new
colors, and they imparted better properties to the dyed
material

Answer 20

2. Synthetic Dyes

Question 21

are water-soluble anionic dyes, containing one or more sulfonic acid
substituents or other acidic groups.

Answer 21

1. Acid Dye:

Question 22

This group was the first of the synthetic dyes to be taken out of coaltar derivatives. They are still used in discharge printing, and for
preparing leather, paper, wood, and straw

Answer 22

2. Basic or Cationic Dye:

Question 23

These are the dyes which can be applied directly to the fabrics from
an aqueous solution. They were widely hailed because they made it
unnecessary to use a mordant or binder in dyeing cotton.

Answer 23

3. Direct Dye:

Question 24

Direct Dyeing Steps

Answer 24

absorption, diffusion, and migration

Question 25

dyes contain at least one azo group (-N=N-) attached to one or often two aromatic rings. These dyes are used primarily for bright red shades in dyeing and printing since most other classes of fast dyes are lacking in good red dyes

Answer 25

4. AZOIC DYE:

Question 26

two main components required by azoic dyes

Answer 26

Coupling component (Naphthol) & Diazonium salt