A number of new results
concerning the prime divisors of zero in the form ring ℱ(A,I) of a Noetherian ring A
with respect to an ideal I in A are found by using certain auxiliary rings of the Rees
ring ℛ(A,I). Then it is shown that in every semi-local ring R there exist
open ideals Q such that the prime divisors of uℛ(R,Q) have a number of
properties known to hold when Q is a normal ideal and R is analytically
unramified.