I think my problem is, I don’t know what material they are made of in real life. Glass? Ceramic? Are they white inside I just don’t know. Any help will be greatly apreiated.
and since they’ve been around for close to a century I’m guessing they’re probably glass.
Other than the inside, I think your material looks fairly good (if a little too perfect) – maybe it could be a little more translucent, eh?