Table 5 Comparative studies have been done on extract green inhibitors for steel in acidic solutions.

Moluccensis extract

1 M HCl

500 mg L⁻¹

68%

⁴⁵

Terminalia arjuna leaves extract

0.2 M HCl

5 g extract/100 solution

64.1%

⁴⁶

Olive leaves extract

2 M HCl,

900 mg L⁻¹

93%

¹⁴

Henna extract

1 M HCl

1.2 g L⁻¹

92.06%

¹⁵

Crude extract of a marine sponge

1 M HCl

2.0 g L⁻¹

82%

³⁹

BLE extract

1 M HCl

400 mg L⁻¹

95.1%

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