Hydrogen peroxide is unstable and should undergo a control check daily prior to use. Growth for catalase testing must be taken from an 18-24 hour culture. Organisms lose their catalase activity with age, resulting in a false-negative reaction.

Catalase is invariably present in aerobes and is also present in some facultative organisms. As a differential test, the catalase test is used to distinguish between streptococci (catalase negative) and staphylococci (catalase positive). Coagulase acts within host tissues to convert fibrinogen to thrombin.

This test demonstrate the presence of catalase, an enzyme that catalyses the release of oxygen from hydrogen peroxide (H2O2). It is used to differentiate those bacteria that produces an enzyme catalase, such as staphylococci, from non-catalase producing bacteria such as streptococci.

The catalase test is a particularly important test used to determine whether a gram-positive cocci is a staphylococci or a streptococci. Catalase is an enzyme that converts hydrogen peroxide to water and oxygen gas. The test is easy to perform; bacteria are simply mixed with H2O2.

Catalase is an antioxidant enzyme that prevents the growth of grey hair and helps restore the natural color of your hair. Catalase-rich foods are broccoli, onions, radish, cucumber, zucchini, red cabbage, apples, pears, grapes, peaches, sprouts, lentils, etc.

Kei says that premature greying due to vitamin B12 deficiency – or pernicious anaemia – is reversible if you increase your intake of the vitamin. Unfortunately, there is not much you can do to prevent or delay greying because the production of melanin is a rather complex process, she adds.

B-6 may help restore hair to its original color following an illness or deficiency. Para-Amino benzoic Acid (PABA) and Pantothenic Acid are part of the family of B-complex vitamins. Both of these vitamins are available at health food stores and pharmacies. Use them to postpone the onset of graying.

Diet, too, plays a vital role. Eating foods rich in omega-3 fatty acids and zinc such as fish, seeds as well as leafy greens like kale and broccoli, can help in reversing the greying process. Some haircare brands have developed products and treatments that claim to be able to help you get your natural colour back.

If your diet isn’t helping, go for vitamin B supplements Chicken, when consumed in large amounts, can provide vitamin B-12 and B-6, which Backe explains has been shown to reduce the occurrence of gray hair. But if you’re not much of a meat-eater, supplements may help.

Grey hair that is caused by aging, thanks to old age, cannot naturally turn black again. But grey hair that originates from discoloration, stress, nutrition, pollution, vitamin deficiency and other physical ailments can be turned black again naturally if cared for properly.

Eat black food Black beans, brown rice and black sesame can be good for your hair colour. And it’s not just because they are black. These food items contain natural colour pigments that can be good for your hair. Other dark coloured food include black fungus, mushrooms and dark seafood and meat.

Top 10 Home Remedies to Get Black Hair Naturally

1. Mulethi and Ghee. This is more like a natural ‘deep-conditioning’ treatment that would work wonders for dry and frizzy hair.
2. Amla.
3. Mango Stones.
4. Mango.
5. Coconut Oil with Lemons.
6. Onion Hair Pack.
7. Coconut Oil and Curry Leaves.
8. Carrots.

Amla is also known as Indian gooseberry. Black sesame seeds (Sesamum indicum). Two to three times a week, eat a tablespoon of black sesame seeds to slow down and possibly reverse the graying process….Eat foods rich in the enzyme catalase such as:

• garlic.
• cabbage.
• sweet potato.
• kale.
• broccoli.
• almonds.

Why and Which fruits are essential for white hair prevention?

• Banana. Eat banana to pass more natural energy to hair; Credit: Wikipedia.
• Amla. Amla fruit is really helpful in the prevention of premature gray hair.
• Lemon Juice.
• Blueberries.
• Avocado.
• Kiwis and Strawberry.

Good food sources of copper are beef liver, lentils, almonds, dark chocolate, and asparagus. Ridge gourd. The ridge gourd is known for restoring hair pigment and stimulating the roots of the hair. Regular massaging of ridge gourd oil can prevent hair from turning white.

As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent color — like gray, silver, or white — as it grows.

The eyebrow hairs get their color from a pigment called ‘melanin’, which is synthesized by our skin. When the balance between two certain chemicals present in this pigment gets disrupted, the hairs of the eyebrows start losing their color and turn white.