Table 3 UPF values, protection class and K/S values of twill weave fabric dyed with natural colorants at different concentrations

Twill weave

2% Madder

> 50

Excellent

0.27

4% Madder

> 50

Excellent

0.44

6% Madder

> 50

Excellent

0.59

2 % Cochineal

> 50

Excellent

0.82

4% Cochineal

> 50

Excellent

1.70

6% Cochineal

> 50

Excellent

1.89

2% Indigo

> 50

Excellent

2.33

4% Indigo

> 50

Excellent

3.76

6% Indigo

> 50

Excellent

4.00