In a book I have, The Eucharist 50 Questions From the Pews, that I bought from Pauline Books and Media, theres a question about Eucharistic miracles. It’s says that “throughout the centuries theologians have debated the validity of these phenomena.”
Aquinas said that “if such occurrences happen it’s because they are allowed by God because the faith of the community is very weak and feeble.”
“Aquinas was also clear that if blood did flow from the consecrated host, it was surely not the blood of Christ.”
Um, tests have been done on the hosts in more modern times that suggest it IS Christs blood.