Nitric acid is used as a cheap means in jewelry shops to quickly spot low-gold alloys ( & lt ; 14 karats ) and to rapidly assess the gold purity .
PROPN PROPN AUX VERB ADP DET ADJ NOUN ADP NOUN NOUN PART ADV VERB ADJ NOUN ( CCONJ X ; NUM NOUN ) CCONJ PART ADV VERB DET NOUN NOUN .