FredG wrote:that mosaic of Justinian I can't be used to demonstrate the real colour.
Then please show us a more reliable contemporary image.
FredG wrote:Annoying isn't it
Well to be honest: No.
Of course I am aware of the fact that every photograph has its color deviation.
And the more pictures of the same object we compare, the smaller that deviation gets. Thats exactly what you did. So thank you for that.
As you know yourself
the first picture can be deleted because there is too much yellow in it.
Look at the face. Look at the white cloth turned yellow.
If we add a lot of yellow to purple, it gets brown, and thats exactly what is seen here.
So.... this picture has gone!
Now lets look at the fourth one:
Looks like there is too much contrast in this picture, especially in the dark tones. Why would an ancient artist use black mosaic stones to depict an imperial cloak?
So.... this picture has gone too!
So we end up with the middle two pictures: both of them show clear purple.
The first one is a purple containing more blue:
The second one containing more red:
Now look at the faces of both fellows: which one looks most healthy?
Exactly, thats also the one with the reddish purple cloak.
The one in the blue-ish purple cloak has a pale white face, which must be an indication for too much red color disappeared from this photograph.
I agree its not as true and clear as maths....
But at least its an indication this emperor is depicted with a purple robe containing pretty much red. Which supports the point Giorgio tried to make.
Which does not tell us much about any other emperors cloak.
FredG wrote:Tyrian purple does not fade with age, it is believed the purple intensifies rather than fades
Thats a real weird story. But I believe you since I have no further knowledge about it.
Now I like to thank Mr. Berry for his terrific contribution.
sberry wrote:which can become a curse, because what if the so-called specialist turns out to be completely clueless?
Feel free to stay out of a discussion if you don't feel happy with it
. But after reading your reply I still believe you are our specialist and you don't just collect your information from the first Google hit you find but from twenty years of writing books and university studies.
sberry wrote:Enter modern chemistry.
Fascinating to realize there are at least 3 chemists participating in this forum: Sberry, Michael Robert and Kekso. Coincidential? Or is it because they feel attracted to the many chemicals used for sculpting, casting, gluing, painting and varnishing?
sberry wrote:Purple snails can also yield plain indigotin, which is a blue dye – it is exactly the stuff that is used for dying blue jeans.
FredG wrote:The natural Indigo dye has a vegetative origin (Indigofera tinctoria) and came mainly from India.
I thought as FredG says here. But talking in terms of chemistry a snail can contain the same basic dye material as a plant I suppose.
So I would like to thank both of you for your extended, very intersting contributions.
Bluefalchion wrote:poor elsi!
Thanks for guarding the ethic element of this discussion, Bluefalchion
I thought that too: Poor Elsi.
Though at the same time: few posts in Benno's Forum get as many attention as this one by Elsi. Like myself: I watched his work a dozen times now to compare his painting work to the many words said about it.
Thats all FREE PUBLICITY for Elsi, isn't it?