My neighbor bought a box of stuff at auction. In it was a box of 12 spools of Aurifil thread. All bright red. He gave it to me. I used it for piecing everything but pale or white fabric. Couldn't see the red thread at all once sewn. It was rather fun to sit down to a bright red spool of thread on the machine. I was told never to piece black with black thread. Use a dark green or brown so the stiches can be seen to be picked out if needed.