Would I LYE to you?
While other lyes can be true, these are known to give the best results
Making Pretzels/Bagels: Sodium Hydroxide (often substituted since it can be dangerous to work with)
Making Ramen Noodles: kansui powder (potassium carbonate and sodium carbonate [which can be made from baking soda]) (Often substituted since it can be difficult to acquire)
Nixtamalization: Potassium Hydroxide - traditional lye made from wood ashes (addresses the low concentration of Cu, Zn and Fe common in tortillas) often substituted with Calcium Hydroxide which is not quite as nutritious.
‘Just a side note. If you find a recipe that uses a different lye, they cannot be exchanged unit for unit. The alkalinity is different so you would either need to calculate the difference or find a recipe with the recommended lye.