Porcelain

Acidic agent

Mean

Std. deviation

Noritake

Lemonade

4.46

2.90

Mineral water

2.53

0.96

Orange juice

1.76

0.68

Black-carrot juice

1.53

0.65

Coke

3.03

2.50

Total

2.66

1.99

Ceramco 3

Lemonade

2.60

2.20

Mineral water

1.06

0.56

Orange juice

1.80

0.59

Black-carrot juice

2.18

1.78

Coke

3.23

1.59

Total

2.17

1.58

Total

Lemonade

3.53

2.64

Mineral water

1.80

1.07

Orange juice

1.78

0.61

Black-carrot juice

1.85

1.32

Coke

3.13

2.00

Total

2.42

1.80