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Hi, You are using a w/v to calculate your NaOH conc. - where the weight of the solute is not additive to the weight of the solvent. But here, on the soap calc they (we) use a w/w calulation where the weight of both the solute and the solvent is additive. Thus the info the soap cal gave you is...

Hi, How did you get the swirl so large? Very nice.

Your right - I work in a laboratory, my assumption was that anyone using sodium hydroxide would have knowledge such as safey issues, did not realize. I wanted to share as the information I have receive from this forumn has been very beneficial to my quest in soap making and I wanted to give...

Hi, you can store your NaOH solution (lye) in borosilicate (pyrex) laboratory glassware. Keep in a safe area and label. I prepare a g/ml solution and keep at ambient temperature, I dilute when necessary. works well.