Well, the dendrite patterns look decent (oddly regular though, I've not seen them form in a grid like that before) and the spark in the pic looks pretty good too. You mentioned to me earlier that you got to a full liquid state so I'm guessing it'll be pretty homogeneous. Looks good from here! 
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Wondering if I've made a nice button of steel or a silly paper weight!!!
Raining tomorrow, might have to wait a day or 2 as the powerhammer is outside.....
Much energy will be expended deciding this.