Some of the older fabric with metallic does keep for quite a while. I have a jacket with crazy quilting using some of the earliest fabrics (over 20 years ago) with metallic. The gold on the fabric is OK, the metallic Sulky embroidery thread changed!
I also decorated my own fabric with Pfaff Maxi stitches on a 1475 since there wasn't much of the gold highlighted fabric available at the time.