I was sorta confused that he thought shell powder = baking soda... isn't the first thing that you think of when you see shell powder calcium carbonate? I guess baking soda is just the go-to base chemical
@Soham24 I think I saw somewhere (no idea in comments or TN or whatever... not even sure if it's true, but...)
apparently new girl is joining very soon this point in the LN
@theShear Hmm... makes sense. It's totally logical for the author to only extensively research on the main thing he was aiming for, i.e. soap, instead of shell powder and probably remembered how vinegar can dissolve shells and went with that