In #6 by Diego Velazquez, I was struck by the focus on Martha's face, with its child-like struggle with jealous resentment, as well as by the image of the Master with Mary and the other student reflected in a wall mirror.
The lavishness of the crystal stemware pictured in Allessandro Allori #4 seemed out of place, but caused me to look up the history of crystalware. Surprisingly, lead-glass artifacts have been found pre-dating the life of Christ; but stemware? I'm thinking 16th century, according to Wikipedia's summary. The Mediterranean olive-grove agricultural style of living depicted most strikingly in #15 (also in 33, 38) is probably more accurate.
Again, the stained glass (41, 42,43), in their essential simplicity, are direct at telling the story, as well as beautiful.
I, too, was skeptical of the crystal (although I was too dull to extend my disbelief beyond the materials to the form); thanks for researching effectively and reporting.
As I understand, wool could be bleached in the sun to achieve a white color. Other colors were obtained from plants, fruits, minerals, shellfish etc. It’s an ancient art and a fascinating subject. Here is a short article on textiles during the Middle Ages.
http://postej-stew.dk/2019/05/medieval-fabrics-part-2/