Hopefully a quick question. I pulled out of my cabinet an alumilite blank that had inside an Eagle Scout medallion on a tube. It's pre-drilled for a PSI Bolt Action pen. I've made and given away many of them. This time, though, when I pulled it out of the cabinet the clear blank portion looked yellow. Do you think it's yellow all the way through? Would heat or age do this? Has anyone seen anything like this.