What Is the pH of Bath Soap?

Save

Soapmakers measure the acidity or alkalinity of bath soap by its pH level on a scale of 0 (acidic) to 14 (alkaline). Substances at either end of the scale, such as sulfuric acid and lye, are harmful to skin.

pH Levels

  • A 2002 International Journal of Dermatology study found pH levels in bath soaps ranging from 3.61 to 12.38. High-pH soaps caused the most irritation.

Significance

Types

  • Liquid soaps generally have lower pH levels than bar soaps. A a 2009 Journal of the European Academy of Dermatology and Venereology study recommends liquid cleansers for bathing infants.

Controversy

  • Although the word "pH-balanced" abounds in advertising to indicate bath soaps with a chemically lowered pH close to 5, natural product makers counter that it is the purity of the ingredients---not the pH---that makes a bath soap kind to skin.

Safety

  • Home soapmaking guides warn hobbyists to test the pH level of their soaps before use. Soapmakers test for safety by using paper or plastic pH test strips, phenolphthalein drops, or even a tongue taste test.

References

  • Photo Credit Image by Flickr.com, courtesy of Debbie Image by Flickr.com, courtesy of woodley wonderworks
Promoted By Zergnet

Comments

Resources

You May Also Like

Related Searches

Check It Out

This Is the Beauty Routine of an Ex-Pat in China

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!