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Comprehensive Cosmetic Industry Ingredient Guide

THIS IS A UNIVERSAL REFERENCE GUIDE FOR EDUCATIONAL PURPOSES

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Ingredient
2Naphthol

2-Naphthol

Summary

2-Naphthol is a versatile cosmetic ingredient that is commonly used in hair dyes, skin care products, and other cosmetic formulations. It is a white crystalline powder that is soluble in alcohol and ether, and has a slightly sweet odor. 2-Naphthol is known for its ability to enhance the color and vibrancy of hair dyes, and is also used as an antioxidant and preservative in skin care products. Additionally, it has been shown to have anti-inflammatory and anti-bacterial properties, making it a valuable ingredient in acne treatments and other skin care formulations. Overall, 2-Naphthol is a highly effective and versatile cosmetic ingredient that offers a range of benefits for both hair and skin care products.

INCI Name and Common References

INCI Name: 2-Naphthol Common Terms: β-Naphthol, 2-Hydroxynaphthalene Nicknames: Naphthol B, C.I. 76625

Function

2-Naphthol is a chemical compound that is commonly used in cosmetic formulations as a colorant and a preservative. It is often added to hair dyes, shampoos, and other hair care products to provide a rich, dark color. Additionally, 2-Naphthol has antimicrobial properties that help to prevent the growth of bacteria and fungi in cosmetic products, which can help to extend their shelf life. However, it is important to note that 2-Naphthol can be irritating to the skin and eyes, and should be used in cosmetic formulations only in small amounts and with caution.

Science

2-Naphthol is a white crystalline solid with a molecular formula of C10H8O. It is a hydroxylated derivative of naphthalene and has a hydroxyl group (-OH) attached to the second carbon atom of the naphthalene ring. This hydroxyl group makes 2-naphthol a polar molecule, which allows it to dissolve in polar solvents such as water and ethanol. In terms of its chemical properties, 2-naphthol is a weak acid with a pKa value of 9.5. This means that in aqueous solutions, it can donate a proton to water molecules to form the 2-naphtholate ion (C10H7O-), which is more stable than the neutral form of the molecule. This ionization process makes 2-naphthol a useful reagent in organic chemistry, as it can participate in various reactions such as nucleophilic substitution and oxidation. In summary, the physical and chemical properties of 2-naphthol allow it to dissolve in polar solvents and act as a weak acid, which makes it a versatile ingredient in various chemical reactions.

Benefits

2-Naphthol is not a recommended ingredient for skincare as it can cause skin irritation and sensitivity. It is primarily used in the manufacturing of dyes and pigments.

Negatives

2-Naphthol is a chemical compound that is commonly used in the production of dyes, pigments, and pharmaceuticals. While it has many useful applications, it can also have some side effects and sensitivities that should be taken into consideration. One potential side effect of 2-Naphthol is skin irritation. This can occur when the compound comes into contact with the skin, causing redness, itching, and inflammation. In some cases, prolonged exposure to 2-Naphthol can lead to more serious skin conditions, such as dermatitis or eczema. Another potential sensitivity to 2-Naphthol is respiratory irritation. This can occur when the compound is inhaled, causing coughing, wheezing, and shortness of breath. People who are sensitive to 2-Naphthol may also experience headaches, dizziness, and nausea. In addition to these side effects, 2-Naphthol can also interact with other ingredients in certain products. For example, it can react with bleach to produce toxic fumes, so it should not be used in combination with bleach-based cleaning products. It can also react with certain metals, such as aluminum and zinc, which can cause corrosion or other damage. Overall, while 2-Naphthol has many useful applications, it is important to be aware of its potential side effects, sensitivities, and interactions with other ingredients. If you experience any adverse reactions to products containing 2-Naphthol, you should discontinue use and seek medical attention if necessary.

Source

2-Naphthol is a naturally occurring organic compound that can be found in coal tar, creosote, and tobacco smoke. It can also be synthesized from naphthalene, a hydrocarbon found in crude oil. The processing pathway for 2-Naphthol involves the oxidation of naphthalene using a variety of methods, including air oxidation, nitric acid oxidation, and chromic acid oxidation. The resulting product is then purified through a series of distillation and crystallization steps to obtain pure 2-Naphthol.

Safety

According to the EWG Skin Deep database, 2-Naphthol has a low to moderate hazard rating, with a score of 4 out of 10. This indicates that it may have some potential health concerns, such as skin irritation or toxicity, but is generally considered safe in small amounts. Other sources, such as the National Library of Medicine's Hazardous Substances Data Bank, also suggest that 2-Naphthol can be harmful if ingested or inhaled in large quantities, but is not likely to cause significant harm in typical use scenarios. Overall, while 2-Naphthol may have some safety concerns, it is generally considered safe when used appropriately and in accordance with recommended guidelines.

Sustainability

2-Naphthol is a chemical compound that is commonly used in the production of dyes, pigments, and pharmaceuticals. While it has many industrial applications, its production and use can have negative environmental impacts. The production of 2-Naphthol involves the use of toxic chemicals and solvents, which can lead to air and water pollution. Additionally, the disposal of waste products from the production process can also contribute to environmental degradation. In terms of ethical sourcing practices, it is important to ensure that the production of 2-Naphthol does not involve the exploitation of workers or the violation of human rights. This may involve working with suppliers who have established ethical labor practices and who prioritize the health and safety of their workers. Overall, while 2-Naphthol has many useful applications, it is important to consider its environmental impact and ethical sourcing practices when using and producing this chemical compound. By taking steps to minimize negative impacts and prioritize ethical practices, we can work towards a more sustainable and responsible use of this ingredient.

Conclusion

In conclusion, 2-Naphthol is a versatile ingredient that is commonly used in the production of dyes, pigments, and pharmaceuticals. Its function as a precursor to various chemicals makes it an essential component in many industries. However, its use has been linked to negative health effects, including skin irritation and respiratory problems. Despite this, it is considered safe for use in small quantities. 2-Naphthol can be sourced from coal tar or petroleum, which raises concerns about its sustainability. Overall, while 2-Naphthol has its benefits, its potential negative effects and unsustainable sourcing should be taken into consideration when using it.

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