In the 3rd pic from the top and looking at the 3rd ingot face, you will notice the ends of the ingot are light color and approx the correct temperature where as the center of the ingot is dull indicating excessive heating for Pb.
When working metals, allot can be learned from just observing the color of the metal. A good example would be the Japanese sword makers that temper there swords at dawn in the rising sun will yield the best sword steel.
The grease is just fine for this type of ingot and use. However when making bullets then bees wax will yield a considerable even weight projectile vs other flux.
After you flux the first time and remove the waste dross, then flux again until a mirror surface is obtained then pour. This will yield the best results.
The reason you ingot edges are ragged is from the mold cooling to fast thus the Pb was sticking to the side of the mold as it cooled. This best can be seen while pouring bullets. You want too keep the mold at near melt temperature as this greatly improves both uniformity and weight consistency. I normally just put my mold into the melt pot before using or for reheating my mold.
The reason I'm using bullet making as a example is a projectile demands the most consistent accuracy so allot can be learned from the process and be applied to working other metals.
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