Pure and Impure Items

Q: Is it permissible to use aagarbattie that contains cow dung?

Q: Is it halaal to own leather products like wallet/phone pouch made from crocodile/alligator/snake skin?

Q: I am from India. Mufti sahab please let me know that can I use liquid stiffener (revive) in our clothes for praying namaz?

Q: Is it haraam to wear pigskin?

Q: If the fat from pigs is chemically processed so as to produce two compounds, both different from the original fat, it would be considered as istihalah?

Q: What is istihaalah? Especialy regarding products from pig?