Marco ,
You are right but it doesnt diminish the value of conception.
I am an archaeologist , drum scanner operator and Heidelberg Serviceman and I am very well aware of the misconception of only printing with CMYK.
And ,
I am sure art collectors will start to demand the thick prints of the original art.
It is possible even todays technology. And I am sure they will do it with nanopowders. I am aware of layers in a painting but it is still better idea to create a nano mixture for the print on paper for these colors.
It is better than CMYK or RGB print.
What is my point , my point is to print with pigment mixtures not with only CMYK.
There are this kind of very expensive inks for print houses. For example , you can want to print a gold colored surface on to National Geographic. These inks for that.
You must look to the fact from here.
And everybody can prepare their black , grey inks with titanium , platinum or whatever they feel right nanopowders. Some of them are cheaper than you think.
Mustafa Umut Sarac