New to Melting lead Foggy and Yellow Ingots.

I just recently started melting lead and before today I have melted about 70 pounds. As the day went on my ingots started to get a foggy color and start to have a yellow brown color to them. Does anyone know what I was doing wrong this time or was it in the lead I had? All of my lead was bought on Facebook. The first 4 ingots I made came out perfect and by the last ingots of the day (about the 16th one) they were foggy and had a yellow or brown tint on them. Any advice to what caused the foggy and yellow color would be appreciated. I use a RCBS 4 1 pound ingot mold.

You usually get more of that sort of thing going on the hotter the pot is.
It's oxidation of the Lead on the surface and whatever else is in it floating out.

Don't worry about it, take normal safety precautions, don't think you'll stir it too much, and continue to march.

Get a thermometer and monitor your temperatures. The gold/yellow tint sounds like tin cooking out.
Good Luck to you,
Rick

thanks everyone for the advice I will try that and see if it helps.

From what I have learned in the past is the goldish tint is usually a higher antimony content and a bluish is closer to dead soft. Get some means of testing hardness, cast a few bullets and test them.

do you have a thermometer. sometimes during a casting session the pot seems to get hotter and hotter, sometimes this happens with my lee bottom pour.
I just turn it down a bit and keep going.
got it on facebook? these days you never know what trace elements might be included in recycled or unknown origin alloys. if hardness is right for what bullets your making and mold fill out is good keep going and before you know it those off color bullets will be down range.