and put it in a vase or other holder so it's the same way up as you found it. Ideally you should make some kind of enclosure so if it emerges when you're not around it doesn't fly away - although emergence usually takes several hours in total so you usually have some warning - the chrysalis will usually become translucent a couple of hours before emergence, so you'll see the outline and color of wings inside. A cardboard box with the lid and/or sides replaced with a material that allows good air circulation such as netting or window screen would work. However, if you have window screen, one of the best containers I've used is a simple cylinder of screen with two cake pans serving as lid and base - very easy to take apart and clean (the butterfly will exude a browninsh liquid on emergence which can stain if you have no protection). (This container is also good for raising caterpillars, if you want to get into that - lots of fun.) The butterfly will need to dry out its wings for a couple of hours before it can fly - it will do that hanging from the stem. Occasionally a chrysalis may have been parisitized in which case there will be no emergence - no easy way to tell, but I wish you good luck!