Bionaphtha (Kosher Anthology 4)
Rabbi Dovid Cohen
Bionaphtha: Naphtha and bionaphtha; Legal fictions (mass balance transfer, ethylene pipeline); Nishtaneh (machlokes, questions, and answers); Masriach, min b'mino, known heter, human intervention; Nifsal mei'achilah. See seforim by Rabbi Cohen at www.kashrushalacha.com