Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!caip!topaz!nike!ucbcad!ucbvax!decwrl!moroney@jon.dec.com
From: moroney@jon.dec.com (Mike Moroney)
Newsgroups: net.misc
Subject: Re: beer bottles
Message-ID: <4204@decwrl.DEC.COM>
Date: Wed, 16-Jul-86 15:35:11 EDT
Article-I.D.: decwrl.4204
Posted: Wed Jul 16 15:35:11 1986
Date-Received: Fri, 18-Jul-86 01:57:42 EDT
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 11

>Why is is that beer bottles are sometimes brown, sometimes green, and
>sometimes clear, but never blue or red or anything else?

Simple.  The brown and green are caused by natural impurities (iron?) in the
sand used to make the glass.  The clear is formed from either purer sand, or
glass where they bothered to remove/neutralize the color-adding impurities.
Other colors would have to be formed by deliberately adding coloring agents
after neutralizing any existing color.  Some colors may also be very difficult
to form (like blue fireworks).  Blue bottles do exist, but are very unusual.

-Mike