Coats sewing thread blue label and red label difference

The main difference between Coats sewing thread blue label and red label is the quality of smoothness. Specifically, the blue label thread has a corespun thread with epic, which has a better quality of smoothness, while the red label thread is an ordinary polyester thread, whose quality of smoothness is not as good as that of the blue label thread. But in terms of usage, red labeled thread and blue labeled thread are the same.