Just as a rider to above, and a vital life-skill for all, if you are offered a carpet/rug which "is silk" - and therefore worth $/£17zillion - try the temperature test. It really
does do the biz.
Silk is noticeably colder than wool or cotton.
The clincher is to ask if you can burn a small piece of fringe for a smell and appearance test.
(It's a scream, honest

)
But, if they agree - it's probably straight. ( silk = blob, and strange odour, anything else else = crook)
The things you learn on MobileRead..................
So, an alternative, ask if you can chuck the ereader on the fire...........