here i found this http://www.wormspit.com/peacesilk.htm i dunno worth a readBecause I hate doing it and there's no substitute for silk and it's a horrific dilemma! It's why I'll go 3 years without a silk run! Plus the worms are so cool you can hear them chewing at the end and they call when they are hungry for more mulberry leaves. They sound beautiful like rainfall. I let way more than I should hatch for eggs too! I'm told if we heat them gradually during the start of pupation they are in a deep sleep and don't feel it. But yeah it's a moral dilemma I don't like.
Sorry for sharing it with you.