The semi-solid blue thread in the photo about is Threadworx’ overdyed Vineyard Silk. It is, quite simply, a lovely thread.
Vineyard Silk is generally recommended for mesh sizes larger than 18 mesh, but I had no problem at all with it on this 18 canvas. I don’t know that it would be great in a solid block of Basketweave, but with textured stitches, there is no problem.
The thread seems slightly softer than non-overdyed Vineyard Silk, but not hugely so. The thread keeps plenty of the directional light (looking different shades with different stitch direction) to add luster and sheen to the piece.
This thread comes in over 20 semi-solid colors, all the threads being different shades of one color. I call these threads semi-solid because they can work to give more energy to a solid area. Imagine using this thread to stitch some blue jeans for example.
Lots of stitchers are afraid to use silk. If you have had bad experiences with silk before or if you have never tried silk, this thread is an outstanding choice. Since it is single ply, you can just cut the skein and go, it doesn’t ravel, has lots of loft so you can use it on many mesh sizes and is easy to use. A great all-purpose silk.