With rim side down, pack clay tightly!
Scrape off excess flush
Turn over and make sure clay is all the way to edge
Talc top surface to prevent sticking
Push pattern into clay 1/2 way down
Add top of flask and talc again.
Compact clay and fill above top.
Separate flask by pulling straight apart
Carefully remove pattern.
Use thumb to create funnel in female side.
Use round bar to create sprue. Smooth 5mm minimum.
Use thumb to create funnel
Use round bar to create sprue. Smooth and 5mm minimum.
Using round toothpick, start making vents.
All vents done and make sure unobstructed.
Both halves done and ready to fit together.
Add flask to holder, add metal to crucible, and cast!