I'm scratching my head and hoping (no, it's not nits!) that someone can help me. I can't get a good enough photo so please bear with me while I try to describe my problem.
I have 2 different colored threads in my machine, a mechanical straight stitch only Juki. Now, when I sew a line my bottom stitches look fine....nicely formed and with no hint of the top thread colour there at all. Excellent. My top stitches also look fine but I have tiny dots of the bottom thread showing through. The stitches are well formed, the thread is not just "lying on top of the fabric" and I can't pull either threads out. So...do I have correct tension? I have tried decreasing my top thread tension, changing bobbin, re-threading etc but it makes no difference, I still have my little dots. Am I over worrying?