How to Test the pH Level of Finished Soap?

Choosing the Right pH Testing Method

When testing the pH level of finished soap, you have two main options: pH test strips and a pH meter. pH test strips are inexpensive and easy to use, but they may not provide highly accurate readings. A pH meter, on the other hand, is more precise and can provide repeatable results, but it requires calibration and is typically more expensive. For off-grid soap making, pH test strips are often a more practical choice.

Preparing the pH Test

To get an accurate reading with pH test strips, you’ll need to prepare a small sample of the finished soap. Cut a small piece of soap off the end or side of the bar, and crumble it into a small container. Add a few drops of distilled water to the soap until it reaches a consistency similar to thin paste. This will help the pH test strips come into contact with the soap more evenly.

Understanding pH Readings

Once you’ve applied the pH test strip to the soap sample, compare the resulting color against a pH chart or scale. pH test strips usually have a color-coded chart on the packaging, with different colors corresponding to different pH levels. For soap making, a pH level between 5.5 and 6.5 is generally considered ideal, as it will help to create a mild and gentle product that won’t irritate skin. If your soap’s pH level is outside of this range, you may need to adjust your recipe or add additional ingredients to achieve the desired pH.