What kind of sand are you using?
It's premixed casting sand. I think I bought it from Thunderbird
What temperature is the bronze when poured?
Not sure. I don't have an immersion pyrometer. I waited until it
looked like a nice little lake of molten bronze, fluxed, then pored.
Are you using a clean crucible?
It's nearly brand new, and has only ben used for bronze.
Are you venting your wand work?
I guess not. How do I do that?
Can you take a picture or the pits and send it to me?
I'll try to cast something and take another pic this weekend. I
ground and polished the last piece.
Is the metal new or scrap or used?
New Oster Bronze D from Contenti.