Getting glass unstuck from mold

[Julie2mm]

I fused 4 one inch penants and all four stuck to the mold.  I had kiln-washed the mold before using. Looking online many mentioned heating the mold/glass up in the kiln to 1000 while having the mold upside down.  I found an alternative and much quicker solution that worked for me.  I put the mold in the freezer for 15-20 minutes. When I pulled the mold out and flipped it over all four pieces dropped out when tapped.  Plan B would have been to reheat!  Julie