Some of the glass objects recovered from ancient monuments look milky instead of beingtransparent. Why?

Some of the glass objects recovered from ancient monuments look milky

1.	Some of the glass objects recovered from ancient monuments look milky instead of beingtransparent. Why?
Answer» As glass is supercooled LET liquid ,so it has TENDENCY to FLOW though very very slow. So if we see ancient GLASSES,they LOOK thicker from bottom as glass flowed down and look less transparent and more milky