Natural aqua glass was often called "green glass," "bottle glass," or "bottle glass green" by glass makers (Kendrick 1968; White 1978).
http://www.sha.org/bottle/colors.htm


bottle glass
noun
glass of a deep green or amber color.
http://dictionary.reference.com/browse/bottle...

Definition of BOTTLE GLASS
: glass from which containers (as bottles or jars) are made: as
a: green glass
b: soda-lime glass that is clear, white, or colored
http://www.merriam-webster.com/dictionary/bot...

I would suspect this might be a technical or historical term; not sure what tag might be appropriate, though, or whether there's a better German translation.

Bottle glass as green glass is correct (think also of "bottle green" as a shade of green http://en.wiktionary.org/wiki/bottle_green)
According to this site http://www.sha.org/bottle/colors.htm the reason is:
Glass which is composed of pure silica (99.9%+) would be colorless glass. However, making glass from pure silica is not practical or commercially viable because of the prohibitive expense of acquiring such in its pure state and the much higher temperatures needed to properly melt. Soda (sodium dioxide) - aka "alkali," "soda-ash," or "potash" in the trade (Trowbridge 1870; Toulouse 1969) - is added to the sand as a "flux" to lower the melting temperature of the silica. Lime (calcium oxide) is added to the batch as a stabilizer since simple glass made from just sand and soda ("water glass") is water soluble making it of little use when formed into a bottle (Tooley 1953; Kendrick 1968; Jones & Sullivan 1989). Broken glass (aka "cullet") on hand from misblown, broken or returned bottles was also often added (Toulouse 1969).

From this point in the glass producing process, the final color of the glass is a matter of both controlling off-coloring impurities and achieving the desired color. This is done by adding certain types of compounds to the glass batch in certain quantities. Bottles made from glass with just the basic ingredients (sand, soda & lime) will usually be different shades of green because of the iron impurities in the sand, though other colors can also be attained depending on many factors. So called "natural" colors are those that result "naturally" from the basic ingredients in a glass batch (McKearin & Wilson 1978). In general, with lesser amounts of iron or less oxidation of that iron, shades of bluish to greenish aqua are achieved. With higher amounts of iron or higher oxidation of the iron, darker greens will usually occur (Toulouse 1969a; Jones & Sullivan 1989)).

Agree with CM2DD that maybe it could be tagged (historical ?)