In modern slaughterhouses, bones are sold to rendering companies,
which turn fresh bones into dry bone chip used for gelatin. However, in
many Asian and African countries, bones are discarded as waste and are
subject to a natural degreasing process. Without going into details of the
degreasing process, it suffices to say that when collecting and selecting
the bones for food-grade or pharmaceutical-grade halal gelatin, bones
must be examined and segregated into bones from halal species and those
from non-halal species, which cannot be used. Bones from animals that
have died without being properly slaughtered or that were used for
religious ceremonies are also prohibited.