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Teach Soap • View topic - Soap Calculator Discrepancies

Teach Soap

Soap Making Recipes, Tips and Tutorials
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PostPosted: Mon Sep 30, 2013 5:48 pm 

Joined: Tue Sep 24, 2013 7:34 pm
Posts: 8
Hi there...very, very new soaper here!

I was getting everything ready for my second batch of CP soap. My first was possibly a disaster, so I decided to go with a very simple recipe that was suggested to me on this forum.

It is:
20% Coconut Oil
30% Olive Oil (I'm using pomace)
50% Lard
7% Super fat
(I was looking for ingredients that were readily available)

I put them in the Bramble Berry lye calculator and reconfigured the amounts to fit in my container (50oz. silicone loaf) and I came up with the following:
Coconut Oil - 6.85oz.
Lard - 17.10oz.
Olive Oil Pomace - 10.27oz.

Here's the problem:
Bramble Berry has these amounts for lye and water
Lye: 4.608oz.
Water: 11.29oz.

Soapcalc has these
Lye: 4.693
Water: 13.004

I went to a few others but they were all a bit off.

I'm not sure which one to follow! The water differences seem pretty large!

Also, in this case, does superfatting just mean a lye discount or should I save some of the oils and add them after trace?

Thanks in advance for your help,
Desiree


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PostPosted: Mon Sep 30, 2013 8:18 pm 
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Joined: Tue Dec 13, 2011 10:08 am
Posts: 3891
Location: Southern NJ!
Superfatting and lye discount are equivalent. You CAN add oils at trace, but lye isn't picky, it will take "what it wants" to quote Irena. So if you add, say shea butter, at trace there is no guarantee that the lye will leave the shea as the superfatted oils.

You can add all of your oils together, mix in the lye water, and get whatever % superfat you calculated for.

As for the differences between calculators; the slight discrepancy in lye amount is due to the fact that saponification values are a range, and not a set number. So there is always a little wiggle room depending on the exact range used in the equations on each site. The water amount variance is likely due to a water percentage difference from site to site. BB's calculator doesn't say what the water as % of oils is, while soap calc lets you adjust this. I suspect that BB is using a different percentage than the standard 38% used by soap calc.

Edited to correct an annoying spelling error that was driving me bonkers!

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~~Heather~~
Mad [soaping] Scientist


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PostPosted: Mon Sep 30, 2013 9:07 pm 
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Joined: Mon Jan 14, 2008 11:14 pm
Posts: 24336
Location: Mistress Of Lather
I pulled your recipe through the Sage lye calc.
I get 9 to 13 fluid ounces of water
4.67 ozs. of lye for a 7% superfat.

SAP values change slightly from season to season and harvest to harvest. Each lye calc averages out this SAP value. That's why you see discrepancies between lye calcs. The water is not so critical.

It's a good idea to round up on your oils and round down on your lye, unless you have a scale that weighs to three digits to the right of the decimal point.

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Irena
Closed minds are like faulty parachutes; they refuse to open.


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PostPosted: Tue Oct 01, 2013 7:15 am 

Joined: Tue Sep 24, 2013 7:34 pm
Posts: 8
Thank you again for your help...soaping this morning, very excited :)


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