I have a curious question for all of you. I have some clear Hemi 43's and they have this yellow streak in them. they are near the mold line and are very thin. They are in different molds and are in slightly different places on the insulators too, but all in the same area. They go from the base to the wire groove. I took some clorox and scrubbed hard and it won't come out. Is this a flaw in the glass? What caused it and why is it in several of the insulators. If any of you can shed some light on this for me, that would be great.