On the morning of May 10, 1718, a priest named Father Francesco Scotto made his way to the Milliavacca Institute for Charitable Works in order to celebrate Mass. It was around 8:00 AM.
The church of the institute was divided into two parts: the front part, where visitors could come in, and the back part, behind the altar, which was reserved for the residents. In the front part, that is in front of the altar, was only the notary, Scipione Alessandro Ambrogio, who was the Bishop’s chancellor and the treasurer of the Institute. In the back part of the church behind the altar were the residents.
When the priest came to the elevation of the Host, Ambrogio noticed that the Host was broken into two parts. Just after the priest lifted the chalice, thinking that a broken Host could not be validly consecrated, came up to the altar to inform the priest, Ambrogio ran immediately into the sacristy to bring another host.
In the meantime, Father Francesco, the celebrant, lifted the Host up with his fingers and found it actually divided precisely in half, and to his infinite astonishment, saw the longitudinal edge of the two parts appear red with blood, and moreover, the base of the chalice and the cup were stained with blood, with some small drops of blood on the corporal itself.
Ambrogio, meanwhile, had arrived with the new host, and observed that the consecrated Host was bleeding. He at once began to weep, and ran immediately to call the canon Argenta, confessor for the institute, Vaglio, a theologian, and Ferrero, the penitentiary, all of whom were also direct witnesses of the Miracle.
At the same time, the other priests as well as three doctors from the city arrived on the scene, all of whom confirmed that the red spots were truly blood.
Among those present, one was afflicted with doubt, thinking that perhaps the blood had dripped from the nose or the mouth of the priest, but some surgeons who were present, after close observation, eliminated all doubt on this issue.
Afterwards, the deputy vicar along with the secretary of the curia and the vicar of the Inquisition, R. Bordino, drafted an official account of the Miracle.
Another important proof of the authenticity of the Miracle comes to us from a document reporting how Monsignor Filippo Artico, Bishop of Asti, had the chalice and Host of the Miracle examined by several experts in physiology, who confirmed the hematic (blood) origin of the red stains.
The Milliavacca Institute for Charitable Works has jealously preserved the relics of the Miracle: the chalice with the blood stains, the Host from the Miracle, though corrupted and reduced to a white film, the paten, the corporal, and the cup of gold-plated silver.