Sand shading is a technique to add depth and realism to marquetry. As its name suggests, you achieve this by immersing the piece in hot sand.
When deciding where to sand shade, consider the light source for your motif. The direction of light incident on the piece is key! An object beneath another will be darkened as will objects that curve away from the source. It’s an exercise in three-dimensional thinking.
In the drawing below, I use a series of “x”s to denote where shading should occur. When executing this design the temperature of the sand, its topography, and length of time the piece is exposed to it govern the effects. This differs in each instance. So, it is important to carefully monitor the process!
When cutting marquetry, it’s best to analyze the drawing to think things through. What is the most efficient path? How do you remove smaller pieces from larger ones so that you can still manipulate the packet?
There are some guidelines:
Begin by backing veneers with newsprint on the “good side” to help support the fibers.
Always cut from the “glue-side”, and tape the show face. This makes things easier when it comes time to mount the marquetry “skin” onto the core.
I tend to cut clockwise around a piece if I’m using the mini-chevalet and the Boulle technique, counter-clockwise if I’m using the double-bevel (conical cutting) or Silas’ method with the fretsaw. This has more to do with which way the teeth are pointing on the blade, and what is easiest for me to see since I’m right-handed.
For a large drawing, build from the center out. This keeps things easy to manipulate, and can help make up for a saw with limited “throat depth”.
Work in logical units. Create each flower individually, for example, then add that into its surroundings as the design is created.
Is it possible to render your drawing as marquetry? While we can cut rice-grain-sized pieces, sometimes the design must be modified for details that are just too small to be composed in wood veneer, or beyond the marqueteer’s skill level!
Apologies if this post is “in the weeds”. I thought it might provide insight into the process of creating marquetry (and parquetry!) since this is an almost unknown art form in North America in my experience.