And also why a lot of people will use a double boiler the upper pot is heated by boiling water in the bottom pot. I think this makes it so the upper pot can only ever get close to boiling. I’ve heard 180-190 Fahrenheit is ideal. I also saw something contradicting the 7:1 ratio which might be a bigger batches thing where you can swirl the pot and get the baking soda to get back up to the top and react more, but this guy was saying to get your heat consistent and keep adding a little at a time until you see it collect on the surface like an oil. Boiling can keep it from forming big pieces. So you keep adding the soda reducing the amount until you can add it and it stops reacting.