This Fil Au Chinois polyester filament thread exists in shaded and contrasting colours. The two terms are easy to understand: a shaded thread has a base colour in different tones from light to dark, contrasting threads are an alliance of different colours. Attention: these threads are dyed on large cones and then wound on spools. It is technically impossible to start this winding at exactly the same place, which is why some spools can have a different aspect. However, the frequency of shading or contrasting is always the same.