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Table 2 Development of base hair coloring gel

From: Alternative application approach on black bean: hair coloring product

Ingredients (% w/w)

Formula

A

B

C

DI water

Ethanol

66.32

66.32

66.32

Propylene glycol

Vitamin E acetate

0.04

0.04

0.04

Disodium EDTA

Purple spirit

1.04

1.04

1.04

Triethanolamine

Carbomer

0.50

0.50

0.50

Xanthan gum

0.30

HEC

0.30

HPMC

0.30

Phenoxyethanol/ethylhexylglycerin

1.00

1.00

1.00

Initial

 pH

4.97 ± 0.02

4.97 ± 0.01

4.97 ± 0.02

 Viscosity (cps)

123,000.00 ± 13,228.76

304,333.33 ± 12,423.10

410,666.67 ± 30,022.21

 L*

37.24 ± 0.01

35.76 ± 0.01

34.71 ± 0.01

 a*

− 0.10 ± 0.01

0.06 ± 0.02

0.04 ± 0.01

 b*

0.42 ± 0.01

− 0.47 ± 0.01

− 0.28 ± 0.01

 h*

103.36 ± 1.03

276.98 ± 2.15

277.45 ± 0.15

 Visual observed color

Clear light yellow gel

Opaque colorless gel

Opaque colorless gel

 Precipitation/separation

None

None

None

Accelerated stability test

 pH

4.87 ± 0.01

4.84 ± 0.01

4.80 ± 0.03

 Viscosity (cps)

357,333.00 ± 17,243.00

584,333.00 ± 16,258.00

575,000.00 ± 9643.00

 L*

33.25 ± 0.02

31.96 ± 0.02

31.59 ± 0.28

 a*

− 0.02 ± 0.03

− 0.03 ± 0.06

− 1.08 ± 0.52

 b*

0.37 ± 0.01

− 0.51 ± 0.01

− 0.54 ± 0.42

 h*

92.78 ± 3.83

266.41 ± 6.34

203.61 ± 13.24

 ΔE

3.99 ± 0.03

3.81 ± 0.02

3.36 ± 0.42

 Visual observed color

Clear light yellow gel

Opaque colorless gel

Opaque colorless gel

 Precipitation/separation

None

None

None