Quantcast

Testing PH

SoapMakingForum

Help Support SoapMakingForum:

gsc

Well-Known Member
Joined
Jan 13, 2014
Messages
169
Reaction score
8
Other than using the "tongue" method I'd like to hear how you test the PH of your finished soap. I have paper test strips but have read somewhere that they are not very reliable.
 

not_ally

Well-Known Member
Joined
Jul 24, 2014
Messages
2,939
Reaction score
1,686
Location
Los Angeles
The general consensus is that they are not. Some reputable sources (Anne Watson, who is a great soapmaker) disagree. But for me, if there is a safety question and I can just zap test, it is *so* much easier, and pretty much fail-proof.
 

Susie

Supporting Member
Joined
Aug 1, 2013
Messages
9,641
Reaction score
9,075
Location
Texas
Well, by ruling out the "tongue" (AKA Zap) test, you have told the overwhelming majority of forum members not to reply.

You see, the question is not what the pH is, it is whether there is still free lye in the soap that poses a safety danger to potential users. The test for that is the "zap" test. To test the pH, you need a laboratory, or be willing to spend the money to send your soap into one to get a true pH reading.
 

The Efficacious Gentleman

Lifetime Supporter
Joined
Nov 19, 2013
Messages
8,962
Reaction score
9,006
Location
Austria
As Susie said! (I agree with Susie a lot, I think that we would have great fun eating some of her southern cooking)

To tell the actual pH of a soap you need a good pH meter, properly calibrated, and a 1% soap solution. Then you can get your pH..........

........but what does that tell you? What pH is safe and unsafe? Is that the same from recipe to recipe? No, it isn't. There is no single pH barrier at which soaps are either safe or unsafe. So you would still need to benchmark your soaps somehow in order to know what pH is okay and what is not.

So you benchmark a soap and it has a pH of 11.2. Then you make another batch and it is 11.5. Is that now unsafe?

So I zap test.
 
Top