Bob Purcell’s recommendation:
I’m not one to point out a problem without proposing a solution, so here is how to deal with inaccurate labels: Ignore the weight number on the label. Choose thread based on the type of fiber, look, feel, and thickness and not by the printed weight size. Trust your eyes and fingers more than the label. You’ll get better results and be much happier with your selection. Choose fine threads to blend and medium and heavier threads to show.
Read Bob’s full article at the Superior blog‘s Education section.
It is amazing that such a large industry as threads does not have a reliable standard that tells us the entire story about specific grades (wight!) of threads. I started relying on my eyes and fingers in the last 2 years, as I ran into problems on the longarm machine while trying to optimize its performace. In embroidery work, I love its sheen and strength.
It works; get familiar, really familiar with one brand of thread, and you won’t regret your decision. I like (love!) Superior Threads. This is an unsolicited statement – I am not getting paid to say this. There is not enough thread anywhere to get me to say this, if I was not convinced.
Do not miss: Embedded in the article is a link to a wonderful PDF document, Superior’s Thread Selection Chart. Download it, and keep it handy.