I certainly learned my lesson yesterday. Prewash cheap black fabric before sewing. My hands and fingernails were black after i got done sewing silver spiderwebs on my daughters witch costume. (Politically incorrect but it's been that or a fairy every year - at least it's not a sexy out outlandishly short costume - this one covers all)
Anyway after dinner last night, i went to wash up and found I had black smudges all over my face. Thank goodness I didn't go anywhere. My family - either didn't notice or are way to polite to comment. ( I'm betting on a bit of both)
Well off to sew more spiderwebs as the drier will be done soon.