Colour part 2

Question 1

Solubility of dyes

Answer 1

soluble

Question 2

Solubility of pigments

Answer 2

generally insoluble

Question 3

Pigment colour depends on

Answer 3

size shape and distribution of particles

Question 4

Pigment solubility depends on

Answer 4

compound, temp, pressure, ions, pH

Question 5

Strength of pigment affinity to application median

Answer 5

Weak

Question 6

White inorganic pigment

Answer 6

Zinc Oxide, Titanium dioxide

Question 7

Blue inorganic pigment

Answer 7

Ultramarine blue (deep blue) to pink colour, Prussian Blue (cheap)

Question 8

Red/ brown/ Black inorganic pigments

Answer 8

Iron III oxides, Iron II oxides

Question 9

aluminum potassium silicates

Answer 9

Micas, special effect pigments

Question 10

Advantages of surface treated pigments

Answer 10

Dispersibility properties, Feel and performance.

Question 11

Hypsochromic shift

Answer 11

move in absorbance to shorter wavelength

Question 12

Bathochromic shift

Answer 12

move in absorbance to longer wavelengths

Question 13

Adjusting colour in Organic Colourants

Answer 13

Extension of conjugated system, Altering number and position of substituents, Bathochromic or Hypsochromic shift.