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International Journal of Interdisciplinary Research

Table 4 Factors and coding level of center combination experiment

From: The effect of washing parameters on the quantity of dye discharge from clothes

Factor

Unit

Coding level

− 2

− 1

0

1

2

A: Washing time

min

15

20

25

30

35

B: Washing temperature

℃

20

30

40

50

60

C: Washing water volume

L

10

15

20

25

30

D: Weight of FSC

g

25

50

75

100

125