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2. Sodium hydroxide - Wikipedia

   en.wikipedia.org/wiki/Sodium_hydroxide

   Sodium hydroxide is a popular strong base used in industry. Sodium hydroxide is used in the manufacture of sodium salts and detergents, pH regulation, and organic synthesis. In bulk, it is most often handled as an aqueous solution, [28] since solutions are cheaper and easier to handle.

3. Shaving soap - Wikipedia

   en.wikipedia.org/wiki/Shaving_soap

   Sodium hydroxide creates a harder soap such as is used in pucks, where potassium hydroxide facilitates creation of a softer soap which loads on the brush more easily. [6] Historically, tallow has been a popular ingredient in shaving soaps and is still in use in some traditional products.

4. Lye - Wikipedia

   en.wikipedia.org/wiki/Lye

   A lye refers to sodium hydroxide and potassium hydroxide. The word lye most accurately refers to sodium hydroxide (NaOH), [citation needed] but historically has been conflated to include other alkali materials, most notably potassium hydroxide (KOH). In order to distinguish between the two, sodium hydroxide may be referred to as soda lye while ...

5. Perm (hairstyle) - Wikipedia

   en.wikipedia.org/wiki/Perm_(hairstyle)

   The hair was wrapped in a spiral around rods connected to a machine with an electric heating device. Sodium hydroxide (caustic soda) was applied and the hair was heated to 212 °F (100 °C) or more for an extended period of time. The process used about twelve 2-pound (0.9 kg) brass rollers and took six hours to complete. These hot rollers were ...

6. Relaxer - Wikipedia

   en.wikipedia.org/wiki/Relaxer

   A relaxer is a type of lotion or cream generally used by people with tight curls or very curly hair which makes hair easier to straighten by chemically "relaxing" the natural curls. The active agent is usually a strong alkali, although some formulations are based on ammonium thioglycolate or formaldehyde.

7. Chemical drain cleaners - Wikipedia

   en.wikipedia.org/wiki/Chemical_drain_cleaners

   Drain cleaners usually contain a strong base such as sodium hydroxide that decomposes hair and converts fats into water-soluble products. The reaction is exothermic, releasing heat to soften the fats. Drain cleaners can also contain aluminum, which reacts with sodium hydroxide to produce bubbles of hydrogen gas that help to break up the clog. [11]