A springy noodle is not always the result of extra kneading. In many Chinese-style wheat noodles, alkaline salts help shape the texture as well as the flavour. The ingredient list may mention sodium carbonate or potassium carbonate; a yellow appearance alone does not tell you whether the noodles contain egg.
Food researchers have examined how sodium carbonate changes starch behaviour and the structure of noodle dough. A study of alkaline yellow noodles found changes in properties including gelatinisation and dough stability. That is evidence of a chemical contribution to texture, not a recommendation to add an arbitrary spoonful to any dough.
Choose for the dish you are making
Start with the packet’s intended use. A thin noodle for soup and a thicker noodle intended for a stir-fry may need different handling even when both contain alkaline salts. Fresh, dried and partly cooked products also belong to different starting points. Keep the cooking directions until the meal is finished.
For a practical comparison, prepare a small portion separately before adding the main batch to a strongly flavoured sauce. Taste for firmness and the characteristic alkaline note. Then consider the finished dish: a noodle that feels slightly firm on its own may soften further in broth, while one overcooked in the first pot is unlikely to recover its structure in the wok.
Do not use colour as an ingredient test
If someone avoids eggs, inspect the ingredients and allergen statement instead of choosing the palest noodles. Likewise, “alkaline” does not mean gluten-free: these are commonly wheat-based products. Restaurant descriptions and translations can be imprecise, so ask about the actual noodles being used.
Making them from scratch calls for a tested recipe and food-grade ingredients. Household cleaning alkalis are not substitutes for culinary products, and differently concentrated alkaline solutions are not interchangeable by volume. For an ordinary weeknight meal, a clearly labelled noodle gives you fewer variables to manage. Keep a note of the brand, cut and cooking result; next time, you can adjust the sauce and timing with a known starting point.