See how long the flavors (and acidity and tannins) linger.
After you spit, wait, and savor. Do the original flavors evolve into new ones?  How long do the flavors last? Describe the FINISH (aftertaste) – Is it clean? Bitter? Refreshing? Fruity?  Mouthwatering?  Don’t sip the next wine too soon.  See how long the flavors (and acidity and tannins) linger.  A long (clean, pleasant) finish is one sign of wine quality!