Ok two weeks ago I mixed up a pile of lead in my cooker over 300 lbs and poured ingots .. I wanted to mix up a large batch so that from my first to last bollet they'd be the same.. I added tin to the mix so as to get close to 20:1 (I'm shooting BPCR shoots with Sharps rifles) all my ingots poured out a dull silvery finish my last batch,months ago, was shiny ingots.. and I've made a few hundred bollets and they also are a dull silver ,not the shiny look I like to see..
SO MY QUESTION ::: WHY???