For many years i did not like Trebizond Silk. I know many stitchers who don’t like Kreinik’s Silk Serica. In both cases the threads have similar structures. They are very smooth silks so they can snag easily. When they snag, they get dull. But that isn;t the only difficulty, both threads can come untwisted as you stitch. For Trebizond this happens if you stitch left-handed. For Silk Serica, this happens for right=handers. Untwisting happens because you turn the thread just a little bit as you stitch. Doing this can cause some twisted threads to become untwisted.
As a result, stitchers avoid these threads. That means they want to know about substitutes.
Melita Glavin recently encountered this problem in her ANG chapter. The project called for Trebizond. She tested three other threads as substitues and pictured the results. You can learn all about it in her post.