Very quick question about dual lye soap!

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toxikon

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I'm thinking about whipping up a batch of cp soap tonight and now that I have some KOH, I'm intrigued by 5% KOH/95% NaOH soaping.

Just one (potentially stupid) question, which I can't seem to find an answer to.

Can you combine the KOH and NaOH together with one container of water? Or do you need to have a KOH + water solution and a NaOH + water solution that you add to your oils separately?

Thank you thank you!
 

kchaystack

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I just add the amount of KOH to my NaOH solution.

I masterbatch my lye, so I measure out my extra liquid to get to the concentration I want to soap at, add my MB amount and then add the KOH crystals and stir to dissolve.
 

toxikon

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I just add the amount of KOH to my NaOH solution.

I masterbatch my lye, so I measure out my extra liquid to get to the concentration I want to soap at, add my MB amount and then add the KOH crystals and stir to dissolve.
Great, thank you! I've never worked with KOH so I just wanted to make sure I wasn't doing something disastrous.
 

DeeAnna

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What KC said. Just want to emphasize -- you need water that is equal to or more than the total combined weight of NaOH and KOH.

First time I tried this, I added the dry KOH to a 50% NaOH solution, and the KOH didn't dissolve. This got me a bit flustered, but there was no harm done. I just added the extra water needed for the KOH and all was well.
 

toxikon

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What KC said. Just want to emphasize -- you need water that is equal to or more than the total combined weight of NaOH and KOH.

First time I tried this, I added the dry KOH to a 50% NaOH solution, and the KOH didn't dissolve. This got me a bit flustered, but there was no harm done. I just added the extra water needed for the KOH and all was well.
So if I usually use 35% Lye Concentration, will that be enough water? Assuming I'm using the Soapee calc to calculate lye amounts.
 

DeeAnna

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Yep, that will work plenty good.

Soapee will calculate the right amount of water for your recipe.
 
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