Indicator

pKa

Color change

pH range

1a

6.83

Light yellow to light green

6.44 - 7.08

1b

7.22

Light yellow to dark green

6.59 - 8.18

1c

7.57

Light violet to dark red

6.56 - 7.82

1d

6.93

Light yellow to dark violet

6.45 - 7.53

1e

7.56

Yellow to dark green

6.87 - 8.24

1f

7.34

Orange to dark violet

6.55 - 7.78

1g

8.12

Colorless to light red

6.79 - 8.34

1h

7.38

Colorless to red

7.02 - 7.53

1i

7.47

Yellow to dark violet

6.85 - 7.59

1j

7.21

Light violet to red

7.24 - 7.78

1k

6.95

Colorless to blue violet

6.70 - 7.86

3

7.64

Dark orange to light yellow

7.43 - 8.12

4

6.86

Dark red to light yellow

6.45 - 7.23