YOU SAID:

The tartness of his face sours ripe grapes

INTO JAPANESE

彼の顔の酸味は熟したブドウを酸っぱくする

BACK INTO ENGLISH

The acidity of his face makes ripe grapes sour

INTO JAPANESE

彼の顔の酸味は熟したブドウを酸っぱくする

BACK INTO ENGLISH

The acidity of his face makes ripe grapes sour