Table 2 Effect of pH on the color strength.

From: Investigation of the properties of polyester blended knitted fabric dyed with luminescent dyes as a highly visible fabric

Fabrics

pH

Disperse Yellow dye

Disperse Red dye

K/S

L*

a*

b*

∆E

RUI

K/S

L*

a*

b*

∆E

RUI

value

rank

value

rank

Polyester /cotton

5

2.73

70.79

11.96

45.08

53.84

0.186

E

0.87

69.36

30.43

11.74

35.58

0.307

G

7

2.91

72.98

12.33

46.47

55.51

0.307

G

1.08

71.50

31.37

12.10

36.68

0.307

G

9

2.93

73.34

12.39

46.70

55.79

0.262

G

1.11

71.86

31.53

12.16

36.86

0.171

E

Polyester /bamboo

5

1.05

77.87

13.67

37.28

44.43

0.171

E

0.82

75.68

24.61

6.36

26.52

0.222

G

7

1.24

80.28

13.78

38.43

45.80

0.171

E

0.91

78.02

25.37

6.56

27.34

0.262

G

9

1.26

80.68

13.80

38.62

46.03

0.174

E

0.98

78.41

25.50

6.59

27.48

0.289

G

  1. Different pH used at 120 °C for 1 h, L: R 1:40.
  2. L*:(lightness/darkens), a*:(redness/greenness), b*:(yellowness/blueness), ∆E: (overall color difference values in Hunter L, a, b coordinates).
  3. RUI values range can be categorized into If RUI < 0.2 that considered as excellent levelness. (E). If 0.2 < RUI < 0.49 that is considered as good levelness. (G), If RUI is between 0.5 and 1 that means poor levelness. (P), If RUI values are greater than 1 that indicate bad levelness. (B).
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