The potion had no odor, but Jon wasn't sure if it had a taste. He supposed that he'd find out soon enough.
Karyn had eaten nearly half of her hot dog, but hadn't gotten to where Jon added the drop of the love potion. He waited patiently, trying to not let Karyn think something was wrong.
After another minute, however, his patience was rewarded. She took a bite of the "tainted" part of her hot dog. She didn't make any reaction to the taste, so Jon figured that the potion had none.
But after another ten seconds, she looked like she was about to sneeze.
Then she opened her eyes.