After adding the daisy roots, shrivelfig and caterpillar and stirring for two minutes, she adds a little leech juice and the rat spleen. "I hope that was a dash," she says, looking down into her cauldron. She allows her potion to stew for half an hour, checking it every few minutes and stirring now and then. After the potion cools, she fills two vials, labels them and deposits them at professor Airlia's desk.