> I heard an amazing thing on BBC last night... a claim by two folks (Lynn
> Pickett and Clyde Prince) that the shroud of Turin was a photograph made
> by Leonardo da Vinci on an old tablecloth. They said lots of folks were
> experimenting with optics and photographic processes at that time.
That IS interesting. Having heard anumber of years about the Shroud of
Turin, it had first been called feasable in that uric acid comes out from
a body when it has been through tremendous shock in death (I believe that
is how it works) and so it made an image on the linen cloth. The church @
Turin has been very wary of scientific measurements on it however and so
only a few rigorous tests have been applied in the last decade or so. I
think they've checked the style of weaving and even found some portions
of seeds etc. in the material and hence have dated it to have been made
around 1500. Doubts still exist though for many hope it could be the real
piece of cloth placed over Jesus at his entombment.
Anyway, I do know that people were aware of photosensitive materials. The
jews apparently used a specific sea slug that had a yellow slime which
turned purple .. a specific purple .. in light and that is how they got a
special purple for the Torah (I am not cognizent on everything here but I
do know that there was a specific purple used)
I think too that folks were aware of the tanning aspects of oaks and,
what the heck, they had silver and could observe what sulfur did to it.
Didn't mean to ramble on so much, but it surely is interesting that it
might be photographic..certainly it is backwards and might even look like
Leonardo
Jack Fulton
***The eye is the Pencil of Nurture***