Comparison of results from different dyeing processes

Test t probability (%)

Polyamide 6

Polyester

(1) Public supply water with citric acid 0.5 g/L

X

(2) Public supply water with acetic acid 0.5 g/L

and sequestering agent^a 0.5 g/L

1.0

7.9

(1) Public supply water with citric acid 0.5 g/L

X

(3) Hard water (with CaCO₃ 200 mg/L) with acetic acid 0.5 g/L

0.1

1.4

(1) Public supply water with citric acid 0.5 g/L

X

(4) Hard water (with CaCO₃ 200 mg/L) with citric acid 0.5 g/L

1.7

1.4

(1) Public supply water with citric acid 0.5 g/L

X

(5) Hard water (with CaCO₃ 200 mg/L) with

acetic acid 0.5 g/L and sequestering agent^a 0.5 g/L

0.02

11.9

(2) Public supply water with acetic acid 0.5 g/L

and sequestering agent^a 0.5 g/L

X

(3) Hard water (with CaCO₃ 200 mg/L) with acetic acid 0.5 g/L

24.4

29.0

(2) Public supply water with acetic acid 0.5 g/L

and sequestering agent^a 0.5 g/L

X

(4) Hard water (with CaCO₃ 200 mg/L) with citric acid 0.5 g/L

3.8

38.9

(2) Public supply water with acetic acid 0.5 g/L

and sequestering agent^a 0.5 g/L

X

(5) Hard water (with CaCO₃ 200 mg/L) with

acetic acid 0.5 g/L and sequestering agent^a 0.5 g/L

2.0

53.3

(3) Hard water (with CaCO₃ 200 mg/L) with acetic acid 0.5 g/L

X

(4) Hard water (with CaCO₃ 200 mg/L) with citric acid 0.5 g/L

1.9

55.0

(3) Hard water (with CaCO₃ 200 mg/L) with acetic acid 0.5 g/L

X

(5) Hard water (with CaCO₃ 200 mg/L) with

acetic acid 0.5 g/L and sequestering agent^a 0.5 g/L

8.4

5.1

(4) Hard water (with CaCO₃ 200 mg/L) with citric acid 0.5 g/L

X

(5) Hard water (with CaCO₃ 200 mg/L) with

acetic acid 0.5 g/L and sequestering agent^a 0.5 g/L

0.1

2.6