Related: What does kansui do to dough in noodle making?
I'm looking to make my own 拉面-style noodles. I've read up a lot about kansui and making your own kansui with a powder mix of sodium and potassium carbonates. I've also seen some recipes that substitute kansui powder with baking soda.
Can I use baking soda to substitute for kansui? If so, in what proportions? If not, what other common ingredients can I use to substitute?
Best Answer
Harold McGee tackled alkaline noodles a while back. He found that baking baking soda actually changes it from sodium bicarbonate to sodium carbonate. This is a reasonable substitute for the kansui called for in alkaline noodles and can be substituted 1:1 in recipes. The noodles may not get AS yellow as they would with both alkalines present in kansui but it's a small price to pay for not having to hunt down that ingredient.
http://www.nytimes.com/2010/09/15/dining/15curious.html?_r=0
The key part: