If dishes will to be soaked in a porcelain sink, use a dish basin. What follows is a general guideline. Rabbi Schwab should be consulted when any doubt arises. Most of these authorities also forbid chickpeas, peanuts, sesame seeds, and lecithin. Some Ashkenazic authorities permit, while other forbid, the use of legumes in a form other than its natural state, for example, oils.
Sephardic authorities permit the use of all the above.
Consult Rabbi Schwab for guidance in the use of these product. Therefore, the smallest amount of chametz renders the whole admixture chametz and its use on Pesach is prohibited. However, during the rest of the year, chametz follows the normal rules of admixture, i.e., it loses its identity in an admixture of one part chametz and sixty parts of non-chametz. This allows us to differentiate between foods purchased before and during Pesach. Few bakeries bake Kosher for Pesach items.