Why is the Mass called the “unbloody” sacrifice of our Lord on his cross?
It’s quite simple, really. The Mass is called an unbloody sacrifice to clarify the fact that we do not behold the Lord’s bloody body as it was seen on Calvary. Instead his body and blood are under the appearances of bread and wine. But it is the same sacrifice. This distinction became necessary as the result of the denial of the Mass being a sacrifice by various Protestant groups.