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
