In the textile business items that have an actual metal content like speciality fabrics for industry, fire-retardants etc will include a content label mentioning the word 'metal'(the noun), other textiles with shiny threads are labelled as 'metallic' (the descriptive adjective) because they look like metals but actually are not metal threads, only look-a-likes.
These manufacturer labels usually come with the bolts, so when you buy a yard or two, you do not receive it. If you need a full content disclosure you will need to specially request it from the manufacturer. The sales person normally knows nothing about this. This can be a little time consuming and a pain when dealing with small quantities. But it is possible, you just need a little patience.
