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ph levels too low?
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I just made my first batch of BDG soap with KOH reacted glyerin. Followed Legal Eagles guide and let the soap sit for 3 weeks and the ph level was still in the 11-12 range. I added 10 ounces of borax and mixed well and let sit for another week, no change. I added another 10 ounces of borax and mixed and the next day the ph is between 6-7. How do I raise the ph to achieve 9-10? Confused
 
Registered: September 05, 2009Reply With QuoteReport This Post
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Can the borax, and reprocess it but under compensate for there being too much caustic in the original batch. (IE: reduce the amount of caustic a bit) This can happen if your oil is near new and in that case less caustic needs to be used (I think that was covered in Lather!) to get full saponification.



** Biodiesel Glycerine Soap - The Guide
- on 5 continents helping people make & sell soap from the Biodiesel Glycerine.


 
Location: :-) Great White North eh ? | Registered: December 10, 2004Reply With QuoteReport This Post
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I have found that adding certain fragrances can lower the pH. We use mostly essential oils but there is one natural fragrance we have used that many people like which will lower the pH. The most recent batch I made lowered it about a full point from 10.6 to 9.6



 
Registered: April 28, 2008Reply With QuoteReport This Post
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I have noticed that PH 12.5 is mild on my tongue. I didn't know this until I got a PH meter. I always used the battery test until then. Now I have altered my ingredients to get about PH 10.
Has anyone noticed that before? Is it because the glycerin buffers the tongue test?

Bob
 
Location: Western NY | Registered: September 16, 2005Reply With QuoteReport This Post
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There are a lot of ph meters out there, what one do you use?
 
Registered: September 05, 2009Reply With QuoteReport This Post
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My PH Meter looks like this.

 
Location: Western NY | Registered: September 16, 2005Reply With QuoteReport This Post



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Lunk,

The very best way would be to avoid making caustic soap in the first place. This is where an accurate SAP value can help you out. The one size fits all method has several flaws. The biggest is that you can make dangerously caustic soap. Another is that your soap may not be fully saponified -- this can cause soft bar soap and both bar and liquid soap that do not perform as well as it could.

With the amount of borax you used you should have seen a difference, however if the recipe you used was very incompatible with your BDG, meaning the SAP value for your BDG is much lower than 25% then it may take quite a bit of neutralization (lower the pH).

There are a number of things you can do to lower the pH of your failed one size fits all soap.

  • Borax - This is more of a buffer and can also thicken your soap
  • Citric acid - usually in powder form mixed with water
  • Vinegar - add other positive qualities in addition to lowering the pH of your soap
  • Lemon Juice


I have a Blog Post on how to perform the KNC SAP test.

Have a look at my Website it has a wealth of information on making soap from our BDG.

Happy Soaping Smile


-Rick

http://www.knicenclean.com your single-most largest free BDG soaping content on the internet.
SAP Testing, Ingredient Properties, Soap Glossary and Recipes just to name a few.

Making Biodiesel Byproduct Soap Learn how to use your biodiesel byproducts to make great bar and liquid soap!!!

"Closing the loop on biodiesel production one bar at a time!"

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Location: S.E. Michigan | Registered: April 15, 2007Reply With QuoteReport This Post
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