The jurists agree that if pus is expelled by the human body, it is impure, because it comes under the heading of unclean things (Al-khaba’ith: unclean, impure, evil things).

Flowing blood is impure according to scholarly consensus. That is indicated by clear evidence from the Quran and Sunnah.

We may conclude regarding these bones that if they have been burned completely and turned into charcoal or ashes, these ashes are pure (taahir) and they do not affect the permissibility of the sugar which is mixed with them during the refining process.