Most people are familiar with my work, so will readily understand my attraction to this particular piece of art examination, a microscopic look at the Triumph of Bacchus tapestry.

Triumph of Bacchus, design overseen by Raphael, ca. 1518-19; design and cartoon by Giovanni da Udine. Brussels, workshop of Frans Geubels, ca 1560. Paris, Mobilier National, inv. GMTT 1/3. Image © Le.

This photomicrograph shows the warp and weft threads used to create a background detail in the Triumph of Bacchus tapestry.

The horizontal threads are the undyed wool warps that are the backbone of the underlying weave structure to the tapestry.

The decorative vertical threads include both crimson colored silk wefts as well as precious metal weft threads.
How exactly was the gilding of tapestries done in the 16th century? These microscopic images reveal all.
These images show the warp and weft threads used to create a background detail in the Triumph of Bacchus tapestry recently exhibited in “Woven Gold: Tapestries of Louis XIV.”
Viewed from a distance (like when the tapestry is hanging high up on a wall), the combo of the crimson silk with the gold threads looks like a bright copper, and here we can see all the separate colors and textures that build up that look.
The Getty has a fascinating tumblr, Art Under the Microscope, examining all manner of art in microphotographs.