[i]The apron Juan Diego Cuauhtlatoatzin wore was studied by Philip Serna Callahan in 1981 with infrared rays. He reported that the portions of the face, hands, robe, and mantle had been painted in one step, with no sketches or corrections and no paintbrush strokes.
The Nobel Chemistry prize recipient Richard Kuhn said in 1936 that the colouring was not from a mineral, vegetable, or animal source. Studies started in 1956 and continuing to the present by several ophthalmologists, including Dr. Javier Torroella Bueno (1956) and Dr. José Aste Tonsmann (El Secreto de sus Ojos, 2001), claim to have found images reflected in the eyes of the Virgin after amplifying the photographs 2,500 times. The pupils reflect a group of Native Americans and Franciscans.
Some textile experts have said that they cannot understand how the image of Our Lady of Guadalupe has been conserved since 1531, exposed to dust, heat, humidity, and even a bomb without wearing down and without discoloration. [/i]
In addtion,
On November 14, 1921, a factory worker placed a bomb a few feet away from the apron. The explosion demolished the marble steps of the main altar, blew out the windows of nearby homes and bent a brass crucifix, but the fabric suffered no damage.
I’ve attached a picture of the crucifix. This is just a sampling of the really cool tests that have been performed on the image.
Confirmatory bias? I guess, maybe. But it’s not like the evidence that exists is the kind that any scientific minded person would dismiss, if it were not evidence pointing to the existence of God.
So, I’d just as readily submit “denial bias,” as well.