"My purple plates are dry."
Translation:Moje fioletowe talerze są suche.
Well, while you are theoretically right , if you are talking colours with random people and not painters, many Poles (like me) consider purple closer to magenta or maroon (I am writing this with a colour chart from dictionary in front of me), while fioletowy is purple. Also many people will not know what "purpurowy" colour is.
I happen to have a builder's dictionary in my hand,
14 out of 16 phrases with "bolt" translate to "śruba" , two have sworzeń
14 out of 20 phrases with "screw" translate to "śruba" 6 have wkręt
what is your point exacly? that Polish people use śruba for both, like they most often use fioletowy for colour, when English prefer purple.
also where did you find those women who never heard of screwdriver? they don't watch Doctor Who ? :P
http://www.wsjp.pl/index.php?id_hasla=5345&ind=0&w_szukaj=purpurowy purpurowy = having a dark red colour with a shade of "fioletowy"
WSJP.pl considers purpurowy hyponymy of RED.