Just in time for Halloween, Seattle Opera's props guru Pete Olds will teach you a professional's tricks. Olds has been in the blood-making business for more than 20 years and has made blood for operas such as Macbeth and Bluebeard's Castle. Some of that blood stains the dress of the young bride, Lucia di Lammermoor, in Seattle Opera's current production.

This workshop, part of the citywide ArtsCrush Festival, is designed for adults or teens over age 12. Everyone will get a chance to make blood of different varieties and for different uses (thick, thin, sprayable, ooze-able). Everything is provided but beware: You'll get bloody yourself, so be sure to come prepared to get messy (this blood will stain clothing).

If you go: "Get Bloody! How to Make Stage Blood," Oct. 23, 10 a.m., backstage at McCaw Hall, 321 Mercer St., Seattle. There's no charge, but online registration is required, and attendance is limited to the first 25 people to sign up.