When using metallic thread in a regular computerized machine, you need to wind your bobbin only 1/2 way full- the same as when using polynostic- translucent threads. It is MUCH easier to use these threads in your bobbin, so you may need to turn your garment over to sew in the reverse side. Don't use them in both upper and lower.
If you have an embroidery machine, I understand that this prcess is a bit trickier since the heat from the machine can cause the thread to heat up, expand and break more quickly & easily.
Use a thread solvent every time you use this type of thread or any non- standard [other then rayon]. Also, you do need to loosen your tension to avoid thread breakage. You also may wish to consider using a rayon- which can give you multi- colors, or perhaps a silk thread. Silk is pricier, tho. My preferred for decorative purpses is rayon.
Watch your needle size with metallics so as not to overly pierce and permanently mark your fabric.
Sew forth, lou-
<lou-dezynz@sbcglobal.net>