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"fluxing and stirring impurities float to the top"
I don't flux a lot, I do skim.
I've noticed that surface dross is grey, blue or black in the morning and yellow and very thin in the afternoon. Obviously the constant heat is smelting more imprities out as the day progresses.
The reason I don't flux more is that I never drain the pot--for two reasons.
One, it seems that ingot lead/linotype melts down faster if some material is left molten.
Two, I have a bottom pur pot and surface impurities will never sink to the bottom third.
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