1ac5c44c_Troubleshooting_Guide__PROBLEM
[POSSIBLE CAUSES] Cooled too fast. Poured too cold. Poured too fast. Air didn't release. [POSSIBLE SOLUTIONS] Cool slower. Pour at a hotter temperature. Pour more slowly and carefully. Tap the mold to release air bubbles. Also try tilting while pouring. [PROBLEM] 
Air Bubbles
Troubleshooting Guide
PROBLEM